diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 00000000..5ace4600
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 00000000..10e0ef77
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,108 @@
+name: release
+
+on:
+  push:
+    tags: [scallop-*]
+    branches: ['**']
+    paths:
+      - ".github/workflows/release.yml"
+  workflow_dispatch:
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    outputs:
+      release: ${{ steps.release.outputs.release }}
+      version: ${{ steps.release.outputs.version }}
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v6
+
+    - name: Get the release name
+      id: release
+      run: |
+        name=$(sed -rn "/^PACKAGE_NAME=/ s/^.*='(.*)'/\1/p" configure)
+        version=$(sed -rn "/^PACKAGE_VERSION=/ s/^.*='(.*)'/\1/p" configure)
+        release=${name}-${version}
+        ref=${{ github.ref_name }}
+
+        # verify tag name matches configure script
+        if [[ ${{ github.ref_type }} == tag && ${ref} != ${release} ]]; then
+          echo "tag name ${ref} doesn't match package: ${release}"
+          exit 1
+        fi
+
+        echo "release=${release}" >> $GITHUB_OUTPUT
+        echo "version=${version}" >> $GITHUB_OUTPUT
+
+  source:
+    needs: release
+    runs-on: ubuntu-latest
+    env:
+      RELEASE: ${{ needs.release.outputs.release }}
+      VERSION: ${{ needs.release.outputs.version }}
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v6
+      with:
+        path: bash
+
+    - name: Create release tarball
+      run: |
+        # remove unused files
+        rm -r bash/{doc,examples,tests,po}
+
+        # copy non-hidden files
+        mkdir ${RELEASE}
+        cp -a bash/* ${RELEASE}
+
+        # create tarball
+        tar -c -I "xz -9 -T0" -f ${RELEASE}.tar.xz ${RELEASE}
+
+    - name: Build and install
+      run: |
+        cd ${RELEASE}
+
+        # configure using required scallop options
+        ./configure-scallop
+
+        # build static and shared libraries
+        make -j libscallop.a libscallop.so
+
+        # install shared library and headers
+        sudo make install-library install-headers
+
+    - name: Test
+      run: |
+        # verify shared library is installed and pkg-config works as expected
+        pkg-config --modversion scallop
+        pkg-config --exact-version ${VERSION} scallop
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v7
+      with:
+        name: source
+        path: ./*.tar.xz
+        if-no-files-found: error
+        retention-days: 3
+
+  publish:
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: source
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+    - name: Download artifacts
+      uses: actions/download-artifact@v8
+      with:
+        path: artifacts
+        merge-multiple: true
+
+    - name: Create GitHub release
+      uses: softprops/action-gh-release@v3
+      with:
+        files: artifacts/*.tar.xz
+        fail_on_unmatched_files: true
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 00000000..c60d54f4
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,57 @@
+name: test
+
+on:
+  push:
+    branches: '**'
+  workflow_dispatch:
+
+jobs:
+  version:
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.version.outputs.version }}
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v6
+
+    - name: Get the package version
+      id: version
+      run: |
+        version=$(sed -rn "/^PACKAGE_VERSION=/ s/^.*='(.*)'/\1/p" configure)
+        date=${version##*.}
+        expected_date=$(date -u +"%Y%m%d")
+
+        # verify patch date
+        if [[ ${date} != ${expected_date} ]]; then
+          echo outdated scallop patch date: ${date}
+          exit 1
+        fi
+
+        echo "version=${version}" >> $GITHUB_OUTPUT
+
+  test:
+    needs: version
+    runs-on: ubuntu-latest
+    env:
+      VERSION: ${{ needs.version.outputs.version }}
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v6
+
+    - name: Build and install
+      run: |
+        # configure using required scallop options
+        ./configure-scallop
+
+        # build static and shared libraries
+        make -j libscallop.a libscallop.so
+
+        # install shared library and headers
+        sudo make install-library install-headers
+
+    - name: Test
+      run: |
+        # verify shared library is installed and pkg-config works as expected
+        pkg-config --modversion scallop
+        pkg-config --exact-version ${VERSION} scallop
diff --git a/Makefile.in b/Makefile.in
index c4a882f7..218a22d9 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -115,9 +115,13 @@ VERSOBJ = bashversion.$(OBJEXT)
 
 Program = bash$(EXEEXT)
 Version = @BASHVERS@
-PatchLevel = `$(BUILD_DIR)/$(VERSPROG) -p`
+PatchLevel = $(shell $(BUILD_DIR)/$(VERSPROG) -p)
 RELSTATUS = @RELSTATUS@
 
+# scallop targets
+StaticLibrary = libscallop.a
+SharedLibrary = libscallop.so
+
 Machine = @host_cpu@
 OS = @host_os@
 VENDOR = @host_vendor@
@@ -504,11 +508,11 @@ INSTALLED_HEADERS = shell.h bashjmp.h command.h syntax.h general.h error.h \
 		    bashtypes.h xmalloc.h config-top.h config-bot.h \
 		    bashintl.h bashansi.h bashjmp.h alias.h hashlib.h \
 		    conftypes.h unwind_prot.h jobs.h siglist.h \
-		    execute_cmd.h
+		    execute_cmd.h input.h pathexp.h flags.h
 # these can appear in either the source directory or the build directory and
 # are installed by install-headers
 HYBRID_HEADERS = y.tab.h
-INSTALLED_BUILTINS_HEADERS = bashgetopt.h common.h getopt.h
+INSTALLED_BUILTINS_HEADERS = builtext.h bashgetopt.h common.h getopt.h
 INSTALLED_INCLUDE_HEADERS = posixstat.h ansi_stdlib.h filecntl.h posixdir.h \
 	memalloc.h stdc.h posixjmp.h posixwait.h posixtime.h systimes.h \
 	unionwait.h maxpath.h shtty.h typemax.h ocache.h chartypes.h gettext.h \
@@ -636,6 +640,22 @@ $(Program): $(OBJECTS) $(BUILTINS_DEP) $(LIBDEP) .build
 	ls -l $(Program)
 	-$(SIZE) $(Program)
 
+$(StaticLibrary): .build $(OBJECTS) $(BUILTINS_DEP) $(LIBDEP)
+	$(RM) $@
+	$(AR) $(ARFLAGS) $@ $(OBJECTS)
+	-for lib in $(BUILTINS_DEP) $(LIBDEP); do \
+		for obj in $$($(AR) t $$lib); do \
+			$(AR) q $@ $$(dirname $$lib)/$$obj ;\
+		done ;\
+	done
+	$(RANLIB) $@
+
+$(SharedLibrary): .build $(OBJECTS) $(BUILTINS_DEP) $(LIBDEP)
+	$(RM) $@
+	$(eval SCALLOP_LIBRARY = $(SharedLibrary).$(PACKAGE_VERSION))
+	$(CC) $(BUILTINS_LDFLAGS) $(LIBRARY_LDFLAGS) $(LDFLAGS) \
+		-Wl,-soname,${SCALLOP_LIBRARY} -shared -o ${SCALLOP_LIBRARY} $(OBJECTS) $(LIBS)
+
 .build:	$(SOURCES) config.h Makefile $(DEFDIR)/builtext.h version.h $(VERSPROG)
 	@echo
 	@echo "	  ***********************************************************"
@@ -862,8 +882,8 @@ $(SUPPORT_DIR)/bashbug.sh: $(SUPPORT_DIR)/bashbug.sh.in
 	CONFIG_FILES=$(SUPPORT_DIR)/bashbug.sh CONFIG_HEADERS= $(SHELL) ./config.status
 
 # comment out for distribution
-$(srcdir)/configure:	$(srcdir)/configure.ac $(srcdir)/aclocal.m4 $(srcdir)/config.h.in
-	cd $(srcdir) && autoconf
+#$(srcdir)/configure:	$(srcdir)/configure.ac $(srcdir)/aclocal.m4 $(srcdir)/config.h.in
+#	cd $(srcdir) && autoconf
 
 # for chet
 reconfig: force
@@ -925,6 +945,11 @@ install:	.made installdirs
 	-( cd $(PO_DIR) ; $(MAKE) $(BASH_MAKEFLAGS) DESTDIR=$(DESTDIR) $@ )
 	-( cd $(LOADABLES_DIR) && $(MAKE) $(BASH_MAKEFLAGS) DESTDIR=$(DESTDIR) $@ )
 
+install-library:
+	@${SHELL} $(SUPPORT_SRC)mkinstalldirs $(DESTDIR)$(libdir)
+	$(INSTALL) $(INSTALLMODE) $(SharedLibrary).* $(DESTDIR)$(libdir)
+	cd $(DESTDIR)$(libdir) && ln -sf $(SharedLibrary).* $(SharedLibrary)
+
 install-strip:
 	$(MAKE) $(BASH_MAKEFLAGS) INSTALL_PROGRAM='$(INSTALL_STRIP_PROGRAM)' \
 		prefix=${prefix} exec_prefix=${exec_prefix} \
@@ -966,7 +991,7 @@ install-headers: maybe-install-headers
 			${INSTALL_DATA} $(srcdir)/"$$hf" $(DESTDIR)$(headersdir)/$$hf || exit 1; \
 		fi ; \
 	done
-	-$(INSTALL_DATA) $(SUPPORT_DIR)/bash.pc $(DESTDIR)$(pkgconfigdir)/bash.pc
+	-$(INSTALL_DATA) $(SUPPORT_DIR)/$(PACKAGE).pc $(DESTDIR)$(pkgconfigdir)/$(PACKAGE).pc
 
 uninstall-headers-dirs:
 	-$(RMDIR) $(DESTDIR)$(headersdir)/builtins $(DESTDIR)$(headersdir)/include
@@ -981,7 +1006,7 @@ uninstall-headers:
 	for hf in $${SDH} ; do \
 		( cd $(DESTDIR)$(headersdir) && $(RM) $$(basename "$$hf") ) \
 	done
-	-( $(RM) $(DESTDIR)$(pkgconfigdir)/bash.pc )
+	-( $(RM) $(DESTDIR)$(pkgconfigdir)/$(PACKAGE).pc )
 	# uninstall-headers-dirs
 	-$(RMDIR) $(DESTDIR)$(headersdir)/builtins $(DESTDIR)$(headersdir)/include
 	-$(RMDIR) $(DESTDIR)$(headersdir)
@@ -1003,7 +1028,7 @@ LIB_SUBDIRS = ${RL_LIBDIR}  ${HIST_LIBDIR} ${TERM_LIBDIR} ${GLOB_LIBDIR} \
 		${INTL_LIBDIR} ${TILDE_LIBDIR} ${ALLOC_LIBDIR} ${SH_LIBDIR}
 
 basic-clean:
-	$(RM) $(OBJECTS) $(Program) bashbug
+	$(RM) $(OBJECTS) $(Program) $(StaticLibrary) $(SharedLibrary)* bashbug
 	$(RM) .build .made version.h 
 
 clean:	basic-clean
diff --git a/README.md b/README.md
new file mode 100644
index 00000000..dd0f7033
--- /dev/null
+++ b/README.md
@@ -0,0 +1,11 @@
+[![ci](https://github.com/pkgcraft/bash/actions/workflows/test.yml/badge.svg?branch=main)](https://github.com/pkgcraft/bash/actions/workflows/test.yml)
+
+# bash
+
+Forked version of bash supporting shell interactions (e.g. writing builtins or
+modifying variables, arrays, and functions) natively in rust via the scallop crate.
+
+## Development
+
+Note that the development workflow involves rebasing against upstream and force
+pushing to keep the patch stack in order.
diff --git a/builtins/common.c b/builtins/common.c
index a681cee4..af66091d 100644
--- a/builtins/common.c
+++ b/builtins/common.c
@@ -80,47 +80,64 @@ sh_builtin_func_t *this_shell_builtin = (sh_builtin_func_t *)NULL;
    shell. */
 
 static void
-builtin_error_prolog (void)
+builtin_error_prolog (char *buf)
 {
   char *name;
+  int line;
 
   name = get_name_for_error ();
-  fprintf (stderr, "%s: ", name);
+  snprintf(buf, MAX_ERROR_LEN, "%s: ", name);
 
-  if (interactive_shell == 0)
-    fprintf (stderr, _("line %d: "), executing_line_number ());
+  if (interactive_shell == 0) {
+    line = executing_line_number ();
+    if (line != 0) {
+      snprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), _("line %d: "), line);
+    }
+  }
 
   if (this_command_name && *this_command_name)
-    fprintf (stderr, "%s: ", this_command_name);
+    snprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), "%s: ", this_command_name);
 }
 
 void
 builtin_error (const char *format, ...)
 {
   va_list args;
+  char buf[MAX_ERROR_LEN] = "";
 
-  builtin_error_prolog ();
+  builtin_error_prolog (&buf[0]);
 
   va_start (args, format);
-
-  vfprintf (stderr, format, args);
+  vsnprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), format, args);
   va_end (args);
-  fprintf (stderr, "\n");
+
+#if defined (BUILD_LIBRARY)
+  scallop_error(buf);
+#else
+  fprintf (stderr, "%s\n", buf);
+#endif
 }
 
 void
 builtin_warning (const char *format, ...)
 {
   va_list args;
+  char buf[MAX_ERROR_LEN] = "";
 
-  builtin_error_prolog ();
-  fprintf (stderr, _("warning: "));
+  builtin_error_prolog (&buf[0]);
+#if !defined (BUILD_LIBRARY)
+  snprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), _("warning: "));
+#endif
 
   va_start (args, format);
-
-  vfprintf (stderr, format, args);
+  vsnprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), format, args);
   va_end (args);
-  fprintf (stderr, "\n");
+
+#if defined (BUILD_LIBRARY)
+  scallop_warning(buf);
+#else
+  fprintf (stderr, "%s\n", buf);
+#endif
 }
 
 /* Print a usage summary for the currently-executing builtin command. */
@@ -1081,3 +1098,35 @@ set_expand_once (int nval, int uwp)
   return oa;
 }
 #endif
+
+/* Register a given array of new builtins into the internal list. */
+int
+register_builtins (struct builtin **new_builtins, size_t num_new_builtins)
+{
+  size_t total, size, replaced;
+  struct builtin *new_shell_builtins;
+
+  total = num_shell_builtins + num_new_builtins;
+  size = (total + 1) * sizeof (struct builtin);
+
+  new_shell_builtins = (struct builtin *)xmalloc (size);
+  FASTCOPY ((char *)shell_builtins, (char *)new_shell_builtins,
+    num_shell_builtins * sizeof (struct builtin));
+  for (replaced = 0; replaced < num_new_builtins; replaced++)
+    FASTCOPY ((char *)new_builtins[replaced],
+    (char *)&new_shell_builtins[num_shell_builtins + replaced],
+    sizeof (struct builtin));
+
+  new_shell_builtins[total].name = (char *)0;
+  new_shell_builtins[total].function = (sh_builtin_func_t *)0;
+  new_shell_builtins[total].flags = 0;
+
+  if (shell_builtins != static_shell_builtins)
+    free (shell_builtins);
+
+  shell_builtins = new_shell_builtins;
+  num_shell_builtins = total;
+  initialize_shell_builtins ();
+
+  return (EXECUTION_SUCCESS);
+}
diff --git a/builtins/common.h b/builtins/common.h
index a169f494..d21eee5f 100644
--- a/builtins/common.h
+++ b/builtins/common.h
@@ -22,6 +22,7 @@
 #  define __COMMON_H
 
 #include "stdc.h"
+#include "builtins.h"
 
 #define ISOPTION(s, c)	(s[0] == '-' && s[1] == c && !s[2])
 #define ISHELP(s)	(STREQ ((s), "--help"))
@@ -88,6 +89,12 @@ extern void builtin_usage (void);
 extern void no_args (WORD_LIST *, int);
 extern int no_options (WORD_LIST *);
 
+#if defined (BUILD_LIBRARY)
+/* scallop extensions */
+extern int scallop_source_file (const char *);
+extern int scallop_evalstring (const char *, int);
+#endif
+
 /* common error message functions */
 extern void sh_needarg (const char *);
 extern void sh_neednumarg (const char *);
@@ -141,6 +148,7 @@ extern sh_builtin_func_t *find_shell_builtin (const char *);
 extern sh_builtin_func_t *builtin_address (const char *);
 extern sh_builtin_func_t *find_special_builtin (const char *);
 extern void initialize_shell_builtins (void);
+extern int register_builtins (struct builtin **, size_t);
 
 #if defined (ARRAY_VARS)
 extern int set_expand_once (int, int);
diff --git a/builtins/complete.def b/builtins/complete.def
index 236cd42c..d6243542 100644
--- a/builtins/complete.def
+++ b/builtins/complete.def
@@ -51,6 +51,7 @@ $END
 
 #include <config.h>
 
+#if defined (PROGRAMMABLE_COMPLETION)
 #include <stdio.h>
 
 #include "../bashtypes.h"
@@ -916,3 +917,4 @@ compopt_builtin (WORD_LIST *list)
 
   return (ret);
 }
+#endif /* PROGRAMMABLE_COMPLETION */
diff --git a/builtins/declare.def b/builtins/declare.def
index 8f7f4834..76baa9ae 100644
--- a/builtins/declare.def
+++ b/builtins/declare.def
@@ -398,7 +398,7 @@ declare_internal (WORD_LIST *list, int local_var)
 	    pflag = show_name_attributes (list->word->word, nodefs);
 	  if (pflag)
 	    {
-	      sh_notfound (list->word->word);
+	      builtin_warning (_("%s: not found"), list->word->word);
 	      any_failed++;
 	    }
 	}
diff --git a/builtins/enable.def b/builtins/enable.def
index 72da559c..ed6fc787 100644
--- a/builtins/enable.def
+++ b/builtins/enable.def
@@ -472,29 +472,7 @@ dyn_load_builtin (WORD_LIST *list, int flags, char *filename)
     }
 
   if (new)
-    {
-      total = num_shell_builtins + new;
-      size = (total + 1) * sizeof (struct builtin);
-
-      new_shell_builtins = (struct builtin *)xmalloc (size);
-      FASTCOPY ((char *)shell_builtins, (char *)new_shell_builtins,
-		num_shell_builtins * sizeof (struct builtin));
-      for (replaced = 0; replaced < new; replaced++)
-	FASTCOPY ((char *)new_builtins[replaced],
-		  (char *)&new_shell_builtins[num_shell_builtins + replaced],
-		  sizeof (struct builtin));
-
-      new_shell_builtins[total].name = (char *)0;
-      new_shell_builtins[total].function = (sh_builtin_func_t *)0;
-      new_shell_builtins[total].flags = 0;
-
-      if (shell_builtins != static_shell_builtins)
-	free (shell_builtins);
-
-      shell_builtins = new_shell_builtins;
-      num_shell_builtins = total;
-      initialize_shell_builtins ();
-    }
+    register_builtins(new_builtins, new);
 
   free (new_builtins);
   return (EXECUTION_SUCCESS);
diff --git a/builtins/evalfile.c b/builtins/evalfile.c
index 3026c5f0..b59539b5 100644
--- a/builtins/evalfile.c
+++ b/builtins/evalfile.c
@@ -395,3 +395,23 @@ source_file (const char *filename, int sflags)
   run_return_trap ();
   return rval;
 }
+
+#if defined (BUILD_LIBRARY)
+int
+scallop_source_file (const char *filename)
+{
+  int code, result;
+  volatile procenv_t save_top_level;
+
+  COPY_PROCENV (top_level, save_top_level);
+  code = setjmp_nosigs (top_level);
+  if (code) {
+    COPY_PROCENV (save_top_level, top_level);
+    return EXECUTION_FAILURE;
+  }
+
+  result = source_file(filename, 0);
+  COPY_PROCENV (save_top_level, top_level);
+  return result;
+}
+#endif
diff --git a/builtins/evalstring.c b/builtins/evalstring.c
index 2b15b9dd..68fa76fa 100644
--- a/builtins/evalstring.c
+++ b/builtins/evalstring.c
@@ -864,3 +864,23 @@ evalstring (char *string, const char *from_file, int flags)
     
   return (r);
 }
+
+#if defined (BUILD_LIBRARY)
+int
+scallop_evalstring (const char *string, int flags)
+{
+  int code, result;
+  volatile procenv_t save_top_level;
+
+  COPY_PROCENV (top_level, save_top_level);
+  code = setjmp_nosigs (top_level);
+  if (code) {
+    COPY_PROCENV (save_top_level, top_level);
+    return EXECUTION_FAILURE;
+  }
+
+  result = evalstring((char *)string, "scallop", flags | SEVAL_NOFREE);
+  COPY_PROCENV (save_top_level, top_level);
+  return result;
+}
+#endif
diff --git a/builtins/shopt.def b/builtins/shopt.def
index cf6f6be1..3c1946c5 100644
--- a/builtins/shopt.def
+++ b/builtins/shopt.def
@@ -777,7 +777,7 @@ get_shopt_options (void)
   n = sizeof (shopt_vars) / sizeof (shopt_vars[0]);
   ret = strvec_create (n + 1);
   for (i = 0; shopt_vars[i].name; i++)
-    ret[i] = savestring (shopt_vars[i].name);
+    ret[i] = shopt_vars[i].name;
   ret[i] = (char *)NULL;
   return ret;
 }
diff --git a/config-bot.h b/config-bot.h
index 07e910f1..6dd1fd52 100644
--- a/config-bot.h
+++ b/config-bot.h
@@ -93,7 +93,7 @@
 
 /* If the shell is called by this name, it will become restricted. */
 #if defined (RESTRICTED_SHELL)
-#  define RESTRICTED_SHELL_NAME "rbash"
+#  define RESTRICTED_SHELL_NAME "rscallop"
 #endif
 
 /***********************************************************/
diff --git a/config-top.h b/config-top.h
index c47ab01b..1145b7df 100644
--- a/config-top.h
+++ b/config-top.h
@@ -63,7 +63,7 @@
 
 /* If you want to unconditionally set a value for PATH in every restricted
    shell, set this. */
-/* #define RBASH_STATIC_PATH_VALUE "/rbin:/usr/rbin" */
+#define RBASH_STATIC_PATH_VALUE "/dev/null"
 
 /* The value for PATH when invoking `command -p'.  This is only used when
    the Posix.2 confstr () function, or CS_PATH define are not present. */
@@ -174,7 +174,6 @@
 #define SOURCENEST_MAX 0
 
 /* Define to use libc mktemp/mkstemp instead of replacements in lib/sh/tmpfile.c */
-#define USE_MKTEMP
 #define USE_MKSTEMP
 #define USE_MKDTEMP
 
diff --git a/config.h.in b/config.h.in
index 1367eaaa..4687e60a 100644
--- a/config.h.in
+++ b/config.h.in
@@ -162,6 +162,9 @@
    memory contents on malloc() and free(). */
 #undef MEMSCRAMBLE
 
+/* Define BUILD_LIBRARY for library build support. */
+#undef BUILD_LIBRARY
+
 /* Define for case-modifying variable attributes; variables modified on
    assignment */
 #undef CASEMOD_ATTRS
diff --git a/configure b/configure
index a28a3fcf..82b6feea 100755
--- a/configure
+++ b/configure
@@ -1,7 +1,7 @@
 #! /bin/sh
 # From configure.ac for Bash 5.3, version 5.080.
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.72 for bash 5.3-release.
+# Generated by GNU Autoconf 2.72 for scallop 5.3.12.20260606.
 #
 # Report bugs to <bug-bash@gnu.org>.
 #
@@ -603,10 +603,10 @@ MFLAGS=
 MAKEFLAGS=
 
 # Identity of this package.
-PACKAGE_NAME='bash'
-PACKAGE_TARNAME='bash'
-PACKAGE_VERSION='5.3-release'
-PACKAGE_STRING='bash 5.3-release'
+PACKAGE_NAME='scallop'
+PACKAGE_TARNAME='scallop'
+PACKAGE_VERSION='5.3.12.20260606'
+PACKAGE_STRING='scallop 5.3.12.20260606'
 PACKAGE_BUGREPORT='bug-bash@gnu.org'
 PACKAGE_URL=''
 
@@ -894,6 +894,7 @@ enable_xpg_echo_default
 enable_mem_scramble
 enable_profiling
 enable_static_link
+enable_library
 enable_largefile
 enable_nls
 enable_threads
@@ -1468,7 +1469,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-'configure' configures bash 5.3-release to adapt to many kinds of systems.
+'configure' configures scallop 5.3.12.20260606 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1517,7 +1518,7 @@ Fine tuning of the installation directories:
   --infodir=DIR           info documentation [DATAROOTDIR/info]
   --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]
   --mandir=DIR            man documentation [DATAROOTDIR/man]
-  --docdir=DIR            documentation root [DATAROOTDIR/doc/bash]
+  --docdir=DIR            documentation root [DATAROOTDIR/doc/scallop]
   --htmldir=DIR           html documentation [DOCDIR]
   --dvidir=DIR            dvi documentation [DOCDIR]
   --pdfdir=DIR            pdf documentation [DOCDIR]
@@ -1534,7 +1535,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of bash 5.3-release:";;
+     short | recursive ) echo "Configuration of scallop 5.3.12.20260606:";;
    esac
   cat <<\_ACEOF
 
@@ -1620,6 +1621,7 @@ Optional Features:
   --enable-mem-scramble   scramble memory on calls to malloc and free
   --enable-profiling      allow profiling with gprof
   --enable-static-link    link bash statically, for use as a root shell
+  --enable-library        build bash as a library
   --disable-largefile     omit support for large files
   --disable-nls           do not use Native Language Support
   --enable-threads={isoc|posix|isoc+posix|windows}
@@ -1742,7 +1744,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-bash configure 5.3-release
+scallop configure 5.3.12.20260606
 generated by GNU Autoconf 2.72
 
 Copyright (C) 2023 Free Software Foundation, Inc.
@@ -2420,7 +2422,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by bash $as_me 5.3-release, which was
+It was created by scallop $as_me 5.3.12.20260606, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -3750,6 +3752,12 @@ then :
   enableval=$enable_static_link; opt_static_link=$enableval
 fi
 
+# Check whether --enable-library was given.
+if test ${enable_library+y}
+then :
+  enableval=$enable_library; opt_library=$enableval
+fi
+
 
 
 
@@ -3904,6 +3912,10 @@ fi
 if test $opt_memscramble = yes; then
 printf "%s\n" "#define MEMSCRAMBLE 1" >>confdefs.h
 
+fi
+if test $opt_library = yes; then
+printf "%s\n" "#define BUILD_LIBRARY 1" >>confdefs.h
+
 fi
 
 if test "$opt_minimal_config" = yes; then
@@ -3952,7 +3964,7 @@ if test -z "$CFLAGS"; then
 fi
 
 echo ""
-echo "Beginning configuration for bash-$BASHVERS-$RELSTATUS for ${host_cpu}-${host_vendor}-${host_os}"
+echo "Beginning configuration for $PACKAGE_NAME-$PACKAGE_VERSION for ${host_cpu}-${host_vendor}-${host_os}"
 echo ""
 
 
@@ -5175,18 +5187,18 @@ then :
 fi
 if test "$enable_largefile,$enable_year2038" != no,no
 then :
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC option to enable large file support" >&5
-printf %s "checking for $CC option to enable large file support... " >&6; }
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CPPFLAGS option for large files" >&5
+printf %s "checking for $CPPFLAGS option for large files... " >&6; }
 if test ${ac_cv_sys_largefile_opts+y}
 then :
   printf %s "(cached) " >&6
 else case e in #(
-  e) ac_save_CC="$CC"
+  e) ac_save_CPPFLAGS=$CPPFLAGS
   ac_opt_found=no
-  for ac_opt in "none needed" "-D_FILE_OFFSET_BITS=64" "-D_LARGE_FILES=1" "-n32"; do
+  for ac_opt in "none needed" "-D_FILE_OFFSET_BITS=64" "-D_LARGE_FILES=1"; do
     if test x"$ac_opt" != x"none needed"
 then :
-  CC="$ac_save_CC $ac_opt"
+  CPPFLAGS="$ac_save_CPPFLAGS $ac_opt"
 fi
     cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -5215,12 +5227,12 @@ then :
   if test x"$ac_opt" = x"none needed"
 then :
   # GNU/Linux s390x and alpha need _FILE_OFFSET_BITS=64 for wide ino_t.
-	 CC="$CC -DFTYPE=ino_t"
+	 CPPFLAGS="$CPPFLAGS -DFTYPE=ino_t"
 	 if ac_fn_c_try_compile "$LINENO"
 then :
 
 else case e in #(
-  e) CC="$CC -D_FILE_OFFSET_BITS=64"
+  e) CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=64"
 	    if ac_fn_c_try_compile "$LINENO"
 then :
   ac_opt='-D_FILE_OFFSET_BITS=64'
@@ -5236,7 +5248,7 @@ fi
 rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
     test $ac_opt_found = no || break
   done
-  CC="$ac_save_CC"
+  CPPFLAGS=$ac_save_CPPFLAGS
 
   test $ac_opt_found = yes || ac_cv_sys_largefile_opts="support not detected" ;;
 esac
@@ -5260,16 +5272,14 @@ printf "%s\n" "#define _FILE_OFFSET_BITS 64" >>confdefs.h
 
 printf "%s\n" "#define _LARGE_FILES 1" >>confdefs.h
  ;; #(
-  "-n32") :
-    CC="$CC -n32" ;; #(
   *) :
     as_fn_error $? "internal error: bad value for \$ac_cv_sys_largefile_opts" "$LINENO" 5 ;;
 esac
 
 if test "$enable_year2038" != no
 then :
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC option for timestamps after 2038" >&5
-printf %s "checking for $CC option for timestamps after 2038... " >&6; }
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CPPFLAGS option for timestamps after 2038" >&5
+printf %s "checking for $CPPFLAGS option for timestamps after 2038... " >&6; }
 if test ${ac_cv_sys_year2038_opts+y}
 then :
   printf %s "(cached) " >&6
@@ -5413,6 +5423,10 @@ if test "$opt_static_link" = yes; then
 	fi
 fi
 
+# TODO: trigger this via configure option
+# enable position-independent code for library creation
+CFLAGS="$CFLAGS -fPIC"
+
 # set the appropriate make variables for building the "build tools"
 # modify defaults based on whether or not we are cross compiling, since the
 # options for the target host may not be appropriate for the build host
@@ -9357,8 +9371,8 @@ rm -f core conftest.err conftest.$ac_objext conftest.beam \
         LIBS=$save_LIBS
         test $gl_pthread_api = yes && break
       done
-      echo "$as_me:9360: gl_pthread_api=$gl_pthread_api" >&5
-      echo "$as_me:9361: LIBPTHREAD=$LIBPTHREAD" >&5
+      echo "$as_me:9374: gl_pthread_api=$gl_pthread_api" >&5
+      echo "$as_me:9375: LIBPTHREAD=$LIBPTHREAD" >&5
 
       gl_pthread_in_glibc=no
       # On Linux with glibc >= 2.34, libc contains the fully functional
@@ -9384,7 +9398,7 @@ rm -rf conftest*
 
           ;;
       esac
-      echo "$as_me:9387: gl_pthread_in_glibc=$gl_pthread_in_glibc" >&5
+      echo "$as_me:9401: gl_pthread_in_glibc=$gl_pthread_in_glibc" >&5
 
       # Test for libpthread by looking for pthread_kill. (Not pthread_self,
       # since it is defined as a macro on OSF/1.)
@@ -9562,7 +9576,7 @@ fi
 
         fi
       fi
-      echo "$as_me:9565: LIBPMULTITHREAD=$LIBPMULTITHREAD" >&5
+      echo "$as_me:9579: LIBPMULTITHREAD=$LIBPMULTITHREAD" >&5
     fi
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether POSIX threads API is available" >&5
 printf %s "checking whether POSIX threads API is available... " >&6; }
@@ -9809,8 +9823,8 @@ rm -f core conftest.err conftest.$ac_objext conftest.beam \
         LIBS=$save_LIBS
         test $gl_pthread_api = yes && break
       done
-      echo "$as_me:9812: gl_pthread_api=$gl_pthread_api" >&5
-      echo "$as_me:9813: LIBPTHREAD=$LIBPTHREAD" >&5
+      echo "$as_me:9826: gl_pthread_api=$gl_pthread_api" >&5
+      echo "$as_me:9827: LIBPTHREAD=$LIBPTHREAD" >&5
 
       gl_pthread_in_glibc=no
       # On Linux with glibc >= 2.34, libc contains the fully functional
@@ -9836,7 +9850,7 @@ rm -rf conftest*
 
           ;;
       esac
-      echo "$as_me:9839: gl_pthread_in_glibc=$gl_pthread_in_glibc" >&5
+      echo "$as_me:9853: gl_pthread_in_glibc=$gl_pthread_in_glibc" >&5
 
       # Test for libpthread by looking for pthread_kill. (Not pthread_self,
       # since it is defined as a macro on OSF/1.)
@@ -10014,7 +10028,7 @@ fi
 
         fi
       fi
-      echo "$as_me:10017: LIBPMULTITHREAD=$LIBPMULTITHREAD" >&5
+      echo "$as_me:10031: LIBPMULTITHREAD=$LIBPMULTITHREAD" >&5
     fi
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether POSIX threads API is available" >&5
 printf %s "checking whether POSIX threads API is available... " >&6; }
@@ -23287,7 +23301,7 @@ fi
 #AC_SUBST(ALLOCA_SOURCE)
 #AC_SUBST(ALLOCA_OBJECT)
 
-ac_config_files="$ac_config_files Makefile builtins/Makefile lib/readline/Makefile lib/glob/Makefile lib/intl/Makefile lib/malloc/Makefile lib/sh/Makefile lib/termcap/Makefile lib/tilde/Makefile doc/Makefile support/Makefile po/Makefile.in examples/loadables/Makefile examples/loadables/Makefile.inc examples/loadables/Makefile.sample examples/loadables/perl/Makefile support/bash.pc support/bashbug.sh"
+ac_config_files="$ac_config_files Makefile builtins/Makefile lib/readline/Makefile lib/glob/Makefile lib/intl/Makefile lib/malloc/Makefile lib/sh/Makefile lib/termcap/Makefile lib/tilde/Makefile support/scallop.pc"
 
 
 ac_config_commands="$ac_config_commands stamp-h"
@@ -23814,7 +23828,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by bash $as_me 5.3-release, which was
+This file was extended by scallop $as_me 5.3.12.20260606, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -23882,7 +23896,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-bash config.status 5.3-release
+scallop config.status 5.3.12.20260606
 configured by $0, generated by GNU Autoconf 2.72,
   with options \\"\$ac_cs_config\\"
 
@@ -24027,15 +24041,7 @@ do
     "lib/sh/Makefile") CONFIG_FILES="$CONFIG_FILES lib/sh/Makefile" ;;
     "lib/termcap/Makefile") CONFIG_FILES="$CONFIG_FILES lib/termcap/Makefile" ;;
     "lib/tilde/Makefile") CONFIG_FILES="$CONFIG_FILES lib/tilde/Makefile" ;;
-    "doc/Makefile") CONFIG_FILES="$CONFIG_FILES doc/Makefile" ;;
-    "support/Makefile") CONFIG_FILES="$CONFIG_FILES support/Makefile" ;;
-    "po/Makefile.in") CONFIG_FILES="$CONFIG_FILES po/Makefile.in" ;;
-    "examples/loadables/Makefile") CONFIG_FILES="$CONFIG_FILES examples/loadables/Makefile" ;;
-    "examples/loadables/Makefile.inc") CONFIG_FILES="$CONFIG_FILES examples/loadables/Makefile.inc" ;;
-    "examples/loadables/Makefile.sample") CONFIG_FILES="$CONFIG_FILES examples/loadables/Makefile.sample" ;;
-    "examples/loadables/perl/Makefile") CONFIG_FILES="$CONFIG_FILES examples/loadables/perl/Makefile" ;;
-    "support/bash.pc") CONFIG_FILES="$CONFIG_FILES support/bash.pc" ;;
-    "support/bashbug.sh") CONFIG_FILES="$CONFIG_FILES support/bashbug.sh" ;;
+    "support/scallop.pc") CONFIG_FILES="$CONFIG_FILES support/scallop.pc" ;;
     "stamp-h") CONFIG_COMMANDS="$CONFIG_COMMANDS stamp-h" ;;
 
   *) as_fn_error $? "invalid argument: '$ac_config_target'" "$LINENO" 5;;
diff --git a/configure-scallop b/configure-scallop
new file mode 100755
index 00000000..4bfc8c19
--- /dev/null
+++ b/configure-scallop
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+#
+# Configure bash using the required scallop options.
+
+# change working directory to bash repo
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+# load required configure options
+declare -a myconf
+while IFS= read -r line; do
+	[[ -z ${line} || ${line} =~ ^# ]] && continue
+	myconf+=( ${line} )
+done < configure-scallop-options
+
+# configure using defined options
+./configure "${myconf[@]}" "$@"
diff --git a/configure-scallop-options b/configure-scallop-options
new file mode 100644
index 00000000..df8b51c7
--- /dev/null
+++ b/configure-scallop-options
@@ -0,0 +1,19 @@
+# configure options required by scallop
+
+--disable-readline
+--disable-history
+--disable-bang-history
+--disable-progcomp
+--without-bash-malloc
+--disable-mem-scramble
+--disable-net-redirections
+--disable-nls
+
+# job control is required for $PIPESTATUS
+--enable-job-control
+
+# enable restricted shell
+--enable-restricted
+
+# enable scallop library
+--enable-library
diff --git a/configure.ac b/configure.ac
index 5a76267e..f1367601 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,9 +24,11 @@ dnl Process this file with autoconf to produce a configure script.
 AC_REVISION([for Bash 5.3, version 5.080])dnl
 
 define(bashvers, 5.3)
+define(patchlevel, 12)
+define(patchdate, 20260606)
 define(relstatus, release)
 
-AC_INIT([bash], bashvers-relstatus, [bug-bash@gnu.org])
+AC_INIT([scallop], bashvers.patchlevel.patchdate, [bug-bash@gnu.org])
 
 dnl make sure we are using a recent autoconf version
 AC_PREREQ(2.69)
@@ -260,6 +262,7 @@ dnl options that alter how bash is compiled and linked
 AC_ARG_ENABLE(mem-scramble, AS_HELP_STRING([--enable-mem-scramble], [scramble memory on calls to malloc and free]), opt_memscramble=$enableval)
 AC_ARG_ENABLE(profiling, AS_HELP_STRING([--enable-profiling], [allow profiling with gprof]), opt_profiling=$enableval)
 AC_ARG_ENABLE(static-link, AS_HELP_STRING([--enable-static-link], [link bash statically, for use as a root shell]), opt_static_link=$enableval)
+AC_ARG_ENABLE(library, AS_HELP_STRING([--enable-library], [build bash as a library]), opt_library=$enableval)
 
 dnl So-called `precious' variables
 AC_ARG_VAR([CC_FOR_BUILD], [C compiler used when compiling binaries used only at build time])
@@ -383,6 +386,9 @@ fi
 if test $opt_memscramble = yes; then
 AC_DEFINE(MEMSCRAMBLE)
 fi
+if test $opt_library = yes; then
+AC_DEFINE(BUILD_LIBRARY)
+fi
 
 if test "$opt_minimal_config" = yes; then
 	TESTSCRIPT=run-minimal
@@ -432,7 +438,7 @@ if test -z "$CFLAGS"; then
 fi
 
 echo ""
-echo "Beginning configuration for bash-$BASHVERS-$RELSTATUS for ${host_cpu}-${host_vendor}-${host_os}"
+echo "Beginning configuration for $PACKAGE_NAME-$PACKAGE_VERSION for ${host_cpu}-${host_vendor}-${host_os}"
 echo ""
 
 dnl compilation checks
@@ -533,6 +539,10 @@ if test "$opt_static_link" = yes; then
 	fi
 fi
 
+# TODO: trigger this via configure option
+# enable position-independent code for library creation
+CFLAGS="$CFLAGS -fPIC"
+
 # set the appropriate make variables for building the "build tools"
 # modify defaults based on whether or not we are cross compiling, since the
 # options for the target host may not be appropriate for the build host
@@ -1365,12 +1375,7 @@ AC_SUBST(LOCAL_DEFS)
 AC_CONFIG_FILES([Makefile builtins/Makefile lib/readline/Makefile \
 		 lib/glob/Makefile lib/intl/Makefile \
 		 lib/malloc/Makefile lib/sh/Makefile lib/termcap/Makefile \
-		 lib/tilde/Makefile doc/Makefile support/Makefile \
-		 po/Makefile.in examples/loadables/Makefile \
-		 examples/loadables/Makefile.inc \
-		 examples/loadables/Makefile.sample \
-		 examples/loadables/perl/Makefile \
-		 support/bash.pc support/bashbug.sh])
+		 lib/tilde/Makefile support/scallop.pc])
 
 dnl Makefile uses this timestamp file to record whether config.h is up to date.
 AC_CONFIG_COMMANDS([stamp-h], [echo timestamp > stamp-h])
diff --git a/error.c b/error.c
index 10af0709..e9f9312a 100644
--- a/error.c
+++ b/error.c
@@ -48,6 +48,8 @@ extern int errno;
 #endif
 
 extern int executing_line_number (void);
+/* Shared memory buffer used to inject errors. */
+void *SHM_BUF;
 
 #if defined (JOB_CONTROL)
 extern pid_t shell_pgrp;
@@ -58,7 +60,7 @@ extern int give_terminal_to (pid_t, int);
 extern const char * const bash_badsub_errmsg;
 #endif
 
-static void error_prolog (int);
+static void error_prolog (int, char *);
 
 /* The current maintainer of the shell.  You change this in the
    Makefile. */
@@ -71,7 +73,7 @@ const char * const the_current_maintainer = MAINTAINER;
 int gnu_error_format = 0;
 
 static void
-error_prolog (int print_lineno)
+error_prolog (int print_lineno, char *buf)
 {
   char *ename;
   int line;
@@ -80,9 +82,9 @@ error_prolog (int print_lineno)
   line = (print_lineno && interactive_shell == 0) ? executing_line_number () : -1;
 
   if (line > 0)
-    fprintf (stderr, "%s:%s%d: ", ename, gnu_error_format ? "" : _(" line "), line);
+    snprintf (buf, MAX_ERROR_LEN, "%s:%s%d: ", ename, gnu_error_format ? "" : _(" line "), line);
   else
-    fprintf (stderr, "%s: ", ename);
+    snprintf (buf, MAX_ERROR_LEN, "%s: ", ename);
 }
 
 /* Return the name of the shell or the shell script for error reporting. */
@@ -132,6 +134,7 @@ void
 programming_error (const char *format, ...)
 {
   va_list args;
+  char buf[MAX_ERROR_LEN] = "";
   char *h;
 
 #if defined (JOB_CONTROL)
@@ -139,11 +142,14 @@ programming_error (const char *format, ...)
 #endif /* JOB_CONTROL */
 
   va_start (args, format);
-
-  vfprintf (stderr, format, args);
-  fprintf (stderr, "\n");
+  vsnprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), format, args);
   va_end (args);
 
+#if defined (BUILD_LIBRARY)
+  scallop_error(buf);
+#else
+  fprintf (stderr, "%s\n", buf);
+
 #if defined (HISTORY)
   if (remember_on_history)
     {
@@ -158,6 +164,7 @@ programming_error (const char *format, ...)
 
   fprintf (stderr, _("Aborting..."));
   fflush (stderr);
+#endif /* BUILD_LIBRARY */
 
   abort ();
 }
@@ -170,15 +177,20 @@ void
 report_error (const char *format, ...)
 {
   va_list args;
+  char buf[MAX_ERROR_LEN] = "";
 
-  error_prolog (1);
+  error_prolog (1, &buf[0]);
 
   va_start (args, format);
+  vsnprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), format, args);
+  va_end (args);
 
-  vfprintf (stderr, format, args);
-  fprintf (stderr, "\n");
+#if defined (BUILD_LIBRARY)
+  scallop_error(buf);
+#else
+  fprintf (stderr, "%s\n", buf);
+#endif
 
-  va_end (args);
   if (exit_immediately_on_error)
     {
       if (last_command_exit_value == 0)
@@ -191,15 +203,20 @@ void
 fatal_error (const char *format, ...)
 {
   va_list args;
+  char buf[MAX_ERROR_LEN] = "";
 
-  error_prolog (0);
+  error_prolog (0, &buf[0]);
 
   va_start (args, format);
+  vsnprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), format, args);
+  va_end (args);
 
-  vfprintf (stderr, format, args);
-  fprintf (stderr, "\n");
+#if defined (BUILD_LIBRARY)
+  scallop_error(buf);
+#else
+  fprintf (stderr, "%s\n", buf);
+#endif
 
-  va_end (args);
   sh_exit (2);
 }
 
@@ -207,48 +224,64 @@ void
 internal_error (const char *format, ...)
 {
   va_list args;
+  char buf[MAX_ERROR_LEN] = "";
 
-  error_prolog (1);
+  error_prolog (1, &buf[0]);
 
   va_start (args, format);
-
-  vfprintf (stderr, format, args);
-  fprintf (stderr, "\n");
-
+  vsnprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), format, args);
   va_end (args);
+
+#if defined (BUILD_LIBRARY)
+  scallop_error(buf);
+#else
+  fprintf (stderr, "%s\n", buf);
+#endif
 }
 
 void
 internal_warning (const char *format, ...)
 {
   va_list args;
+  char buf[MAX_ERROR_LEN] = "";
 
-  error_prolog (1);
+  error_prolog (1, &buf[0]);
+#if !defined (BUILD_LIBRARY)
   fprintf (stderr, _("warning: "));
+#endif
 
   va_start (args, format);
-
-  vfprintf (stderr, format, args);
-  fprintf (stderr, "\n");
-
+  vsnprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), format, args);
   va_end (args);
+
+#if defined (BUILD_LIBRARY)
+  scallop_warning(buf);
+#else
+  fprintf (stderr, "%s\n", buf);
+#endif
 }
 
 void
 internal_inform (const char *format, ...)
 {
   va_list args;
+  char buf[MAX_ERROR_LEN] = "";
 
-  error_prolog (1);
+  error_prolog (1, &buf[0]);
   /* TRANSLATORS: this is a prefix for informational messages. */
+#if !defined (BUILD_LIBRARY)
   fprintf (stderr, _("INFORM: "));
+#endif
 
   va_start (args, format);
-
-  vfprintf (stderr, format, args);
-  fprintf (stderr, "\n");
-
+  vsnprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), format, args);
   va_end (args);
+
+#if defined (BUILD_LIBRARY)
+  scallop_warning(buf);
+#else
+  fprintf (stderr, "%s\n", buf);
+#endif
 }
 
 void
@@ -276,16 +309,21 @@ sys_error (const char *format, ...)
 {
   int e;
   va_list args;
+  char buf[MAX_ERROR_LEN] = "";
 
   e = errno;
-  error_prolog (0);
+  error_prolog (0, &buf[0]);
 
   va_start (args, format);
-
-  vfprintf (stderr, format, args);
-  fprintf (stderr, ": %s\n", strerror (e));
-
+  vsnprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), format, args);
   va_end (args);
+  snprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), ": %s", strerror (e));
+
+#if defined (BUILD_LIBRARY)
+  scallop_error(buf);
+#else
+  fprintf (stderr, "%s\n", buf);
+#endif
 }
 
 /* An error from the parser takes the general form
@@ -300,27 +338,31 @@ void
 parser_error (int lineno, const char *format, ...)
 {
   va_list args;
+  char buf[MAX_ERROR_LEN] = "";
   char *ename, *iname;
 
   ename = get_name_for_error ();
   iname = yy_input_name ();
 
   if (interactive)
-    fprintf (stderr, "%s: ", ename);
+    snprintf (buf, MAX_ERROR_LEN, "%s: ", ename);
   else if (interactive_shell)
-    fprintf (stderr, "%s: %s:%s%d: ", ename, iname, gnu_error_format ? "" : _(" line "), lineno);
+    snprintf (buf, MAX_ERROR_LEN, "%s: %s:%s%d: ", ename, iname, gnu_error_format ? "" : _(" line "), lineno);
   else if (STREQ (ename, iname))
-    fprintf (stderr, "%s:%s%d: ", ename, gnu_error_format ? "" : _(" line "), lineno);
+    snprintf (buf, MAX_ERROR_LEN, "%s:%s%d: ", ename, gnu_error_format ? "" : _(" line "), lineno);
   else
-    fprintf (stderr, "%s: %s:%s%d: ", ename, iname, gnu_error_format ? "" : _(" line "), lineno);
+    snprintf (buf, MAX_ERROR_LEN, "%s: %s:%s%d: ", ename, iname, gnu_error_format ? "" : _(" line "), lineno);
 
   va_start (args, format);
-
-  vfprintf (stderr, format, args);
-  fprintf (stderr, "\n");
-
+  vsnprintf(buf + strlen(buf), MAX_ERROR_LEN - strlen(buf), format, args);
   va_end (args);
 
+#if defined (BUILD_LIBRARY)
+  scallop_error(buf);
+#else
+  fprintf (stderr, "%s\n", buf);
+#endif
+
   if (exit_immediately_on_error)
     exit_shell (last_command_exit_value = 2);
 }
diff --git a/error.h b/error.h
index db0972bc..825a2070 100644
--- a/error.h
+++ b/error.h
@@ -81,4 +81,9 @@ extern void err_invalidid (const char *);
 #  define INTERNAL_DEBUG(x)
 #endif
 
+/* Maximum length of an error message, the rest is truncated. */
+#define MAX_ERROR_LEN 512
+/* Shared memory buffer used to inject errors. */
+extern void *SHM_BUF;
+
 #endif /* !_ERROR_H_ */
diff --git a/execute_cmd.c b/execute_cmd.c
index 6a22395e..0f06a34f 100644
--- a/execute_cmd.c
+++ b/execute_cmd.c
@@ -788,6 +788,14 @@ execute_command_internal (COMMAND *command, int asynchronous, int pipe_in, int p
 		  jump_to_top_level (ERREXIT);
 		}
 
+#if defined (BUILD_LIBRARY)
+	      if (last_command_exit_value == EX_LONGJMP)
+		{
+		  last_command_exit_value = EXECUTION_FAILURE;
+		  jump_to_top_level (ERREXIT);
+		}
+#endif
+
 	      return (last_command_exit_value);
 	    }
 	  else
@@ -4662,7 +4670,7 @@ execute_simple_command (SIMPLE_COM *simple_command, int pipe_in, int pipe_out, i
 	 being used, and we don't want to exit the shell if a special
 	 builtin executed with `command builtin' fails.  `command' is not
 	 a special builtin. */
-      if (posixly_correct)
+      if (posixly_correct || BUILD_LIBRARY)
 	{
 	  builtin = find_special_builtin (words->word->word);
 	  if (builtin)
@@ -4858,7 +4866,7 @@ itrace("execute_simple_command: posix mode tempenv assignment error");
 	     cmdflags);
 	  if (builtin)
 	    {
-	      if (result > EX_SHERRBASE)
+	      if (result > EX_SHERRBASE || result == EX_LONGJMP)
 		{
 		  switch (result)
 		    {
@@ -4872,6 +4880,12 @@ itrace("execute_simple_command: posix mode tempenv assignment error");
 			  jump_to_top_level (ERREXIT);
 			}
 		      break;
+#if defined (BUILD_LIBRARY)
+		    case EX_LONGJMP:
+		      last_command_exit_value = EXECUTION_FAILURE;
+		      jump_to_top_level (ERREXIT);
+		      break;
+#endif
 		    case EX_DISKFALLBACK:
 		      /* XXX - experimental */
 		      executing_builtin = old_builtin;
@@ -5775,6 +5789,7 @@ execute_disk_command (WORD_LIST *words, REDIRECT *redirects, char *command_line,
   char *pathname, *command, **args, *p;
   int nofork, stdpath, result, fork_flags;
   pid_t pid;
+  sh_builtin_func_t *hookb;
   SHELL_VAR *hookf;
   WORD_LIST *wl;
 
@@ -5902,8 +5917,9 @@ execute_disk_command (WORD_LIST *words, REDIRECT *redirects, char *command_line,
 
       if (command == 0)
 	{
+	  hookb = find_shell_builtin (NOTFOUND_HOOK);
 	  hookf = find_function (NOTFOUND_HOOK);
-	  if (hookf == 0)
+	  if (hookb == 0 && hookf == 0)
 	    {
 	      /* Make sure filenames are displayed using printable characters */
 	      pathname = printable_filename (pathname, 0);
@@ -5921,7 +5937,13 @@ execute_disk_command (WORD_LIST *words, REDIRECT *redirects, char *command_line,
 #endif
 
 	  wl = make_word_list (make_word (NOTFOUND_HOOK), words);
-	  exit (execute_shell_function (hookf, wl));
+	  if (hookb != 0)
+	    {
+	      this_command_name = NOTFOUND_HOOK;
+	      exit (execute_builtin (hookb, wl, 0, 0));
+	    }
+	  else
+	    exit (execute_shell_function (hookf, wl));
 	}
 
       /* Execve expects the command name to be in args[0].  So we
@@ -6407,3 +6429,43 @@ do_piping (int pipe_in, int pipe_out)
 #endif /* __CYGWIN__ */
     }
 }
+
+#if defined (BUILD_LIBRARY)
+int
+scallop_execute_command (COMMAND *command)
+{
+  int code, result;
+  volatile procenv_t save_top_level;
+
+  COPY_PROCENV (top_level, save_top_level);
+  code = setjmp_nosigs (top_level);
+  if (code) {
+    COPY_PROCENV (save_top_level, top_level);
+    return EXECUTION_FAILURE;
+  }
+
+  result = execute_command(command);
+  COPY_PROCENV (save_top_level, top_level);
+  QUIT;
+  return result;
+}
+
+int
+scallop_execute_shell_function (SHELL_VAR *var, WORD_LIST *words)
+{
+  int code, result;
+  volatile procenv_t save_top_level;
+
+  COPY_PROCENV (top_level, save_top_level);
+  code = setjmp_nosigs (top_level);
+  if (code) {
+    COPY_PROCENV (save_top_level, top_level);
+    return EXECUTION_FAILURE;
+  }
+
+  result = execute_shell_function(var, words);
+  COPY_PROCENV (save_top_level, top_level);
+  QUIT;
+  return result;
+}
+#endif
diff --git a/execute_cmd.h b/execute_cmd.h
index cd2bad86..e73326a4 100644
--- a/execute_cmd.h
+++ b/execute_cmd.h
@@ -62,6 +62,7 @@ extern int sourcenest, sourcenest_max;
 extern int stdin_redir;
 extern int line_number_for_err_trap;
 
+extern char *the_printed_command;
 extern char *the_printed_command_except_trap;
 extern COMMAND *currently_executing_command;
 
@@ -136,4 +137,9 @@ extern void uw_close (void *);
 
 extern void init_notfound_str (void);
 
+#if defined (BUILD_LIBRARY)
+extern int scallop_execute_command (COMMAND *);
+extern int scallop_execute_shell_function (SHELL_VAR *, WORD_LIST *);
+#endif
+
 #endif /* _EXECUTE_CMD_H_ */
diff --git a/jobs.c b/jobs.c
index 0f32ebbf..f6b0d0f9 100644
--- a/jobs.c
+++ b/jobs.c
@@ -3389,6 +3389,14 @@ if (job == NO_JOB)
 
   UNBLOCK_CHILD (oset);
 
+#if defined (BUILD_LIBRARY)
+	if (termination_state == EX_LONGJMP)
+	{
+	  last_command_exit_value = EXECUTION_FAILURE;
+	  jump_to_top_level (ERREXIT);
+	}
+#endif
+
   return (termination_state);
 }
 
@@ -4864,7 +4872,8 @@ initialize_job_control (int force)
   if (shell_tty != fileno (stderr))
     SET_CLOSE_ON_EXEC (shell_tty);
 
-  set_signal_handler (SIGCHLD, sigchld_handler);
+  if (job_control)
+    set_signal_handler (SIGCHLD, sigchld_handler);
 
   change_flag ('m', job_control ? '-' : '+');
 
diff --git a/redir.c b/redir.c
index 343536b7..d340b0a9 100644
--- a/redir.c
+++ b/redir.c
@@ -916,7 +916,7 @@ do_redirection_internal (REDIRECT *redirect, int flags, char **fnp)
 	return (AMBIGUOUS_REDIRECT);
 
 #if defined (RESTRICTED_SHELL)
-      if (restricted && (WRITE_REDIRECT (ri)))
+      if (restricted && (WRITE_REDIRECT (ri)) && (strcmp(redirectee_word, "/dev/null") != 0))
 	{
 	  free (redirectee_word);
 	  return (RESTRICTED_REDIRECT);
diff --git a/shell.c b/shell.c
index e59029cc..3270ec56 100644
--- a/shell.c
+++ b/shell.c
@@ -368,10 +368,18 @@ _cygwin32_check_tmp (void)
 #if defined (NO_MAIN_ENV_ARG)
 /* systems without third argument to main() */
 int
+#if defined (BUILD_LIBRARY)
+bash_main (int argc, char **argv)
+#else
 main (int argc, char **argv)
+#endif /* BUILD_LIBRARY */
 #else /* !NO_MAIN_ENV_ARG */
 int
+#if defined (BUILD_LIBRARY)
+bash_main (int argc, char **argv, char **env)
+#else
 main (int argc, char **argv, char **env)
+#endif /* BUILD_LIBRARY */
 #endif /* !NO_MAIN_ENV_ARG */
 {
   register int i;
@@ -2053,6 +2061,65 @@ shell_reinitialize (void)
   shell_reinitialized = 1;
 }
 
+#if defined (BUILD_LIBRARY)
+scallop_cb scallop_error;
+scallop_cb scallop_warning;
+
+void
+lib_init (char **env)
+{
+  set_shell_name("scallop");
+  shell_environment = env;
+  shell_initialize();
+}
+
+void
+lib_error_handlers (scallop_cb error_cb, scallop_cb warning_cb)
+{
+  scallop_error = error_cb;
+  scallop_warning = warning_cb;
+}
+
+void
+lib_reset (char **env)
+{
+  int orig_restricted = restricted;
+  shell_environment = env;
+  shell_reinitialize();
+  restricted = orig_restricted;
+  initialize_shell_variables (shell_environment, privileged_mode||restricted||running_setuid);
+  initialize_shell_options (privileged_mode||restricted||running_setuid);
+  initialize_bashopts (privileged_mode||restricted||running_setuid);
+
+  // reinitialization resets restricted status, so re-enable it if requested
+  if (orig_restricted) {
+    scallop_toggle_restricted(orig_restricted);
+  }
+}
+
+void
+scallop_toggle_restricted (int status)
+{
+  if (status && !restricted) {
+      bind_variable ("PATH", "/dev/null", 0);
+      stupidly_hack_special_variables ("PATH"); /* clear hash table */
+      set_var_read_only ("PATH");
+      set_var_read_only ("SHELL");
+      set_var_read_only ("ENV");
+      set_var_read_only ("BASH_ENV");
+      set_var_read_only ("HISTFILE");
+      restricted = 1;
+  } else if (!status && restricted) {
+      restricted = 0;
+      set_var_read_write ("PATH");
+      set_var_read_write ("SHELL");
+      set_var_read_write ("ENV");
+      set_var_read_write ("BASH_ENV");
+      set_var_read_write ("HISTFILE");
+  }
+}
+#endif
+
 static void
 show_shell_usage (FILE *fp, int extra)
 {
diff --git a/shell.h b/shell.h
index 74d6fd97..8992224d 100644
--- a/shell.h
+++ b/shell.h
@@ -18,6 +18,9 @@
    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#if !defined (_SHELL_H_)
+#define _SHELL_H_
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -65,6 +68,7 @@ extern int EOF_Reached;
 #define EX_NOINPUT	126
 #define EX_NOTFOUND	127
 
+#define EX_LONGJMP	255	/* longjmp to top level */
 #define EX_SHERRBASE	256	/* all special error values are > this. */
 
 #define EX_BADSYNTAX	257	/* shell syntax error */
@@ -250,3 +254,23 @@ extern void uw_restore_parser_state (void *);
 
 extern sh_input_line_state_t *save_input_line_state (sh_input_line_state_t *);
 extern void restore_input_line_state (sh_input_line_state_t *);
+
+#if defined (NO_MAIN_ENV_ARG)
+extern int bash_main (int argc, char **argv);
+#else /* !NO_MAIN_ENV_ARG */
+extern int bash_main (int argc, char **argv, char **env);
+#endif /* !NO_MAIN_ENV_ARG */
+
+#if defined (BUILD_LIBRARY)
+typedef void (*scallop_cb)(char *);
+extern scallop_cb scallop_error;
+extern scallop_cb scallop_warning;
+
+extern void lib_init (char **);
+extern void lib_error_handlers (scallop_cb error_cb, scallop_cb warning_cb);
+extern void lib_reset (char **);
+
+extern void scallop_toggle_restricted (int);
+#endif
+
+#endif	/* _SHELL_H_ */
diff --git a/subst.c b/subst.c
index dd5d57bf..c4556614 100644
--- a/subst.c
+++ b/subst.c
@@ -7468,6 +7468,14 @@ command_substitute (char *string, int quoted, int flags)
       cleanup_the_pipeline ();
 #endif
 
+#if defined (BUILD_LIBRARY)
+	if (last_command_exit_value == EX_LONGJMP)
+	{
+	  last_command_exit_value = EXECUTION_FAILURE;
+	  jump_to_top_level (ERREXIT);
+	}
+#endif
+
       ret = alloc_word_desc ();
       ret->word = istring;
       ret->flags = tflag;
diff --git a/support/scallop.pc.in b/support/scallop.pc.in
new file mode 100644
index 00000000..ac2d0bdc
--- /dev/null
+++ b/support/scallop.pc.in
@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+includedir=@includedir@
+libdir=@libdir@
+headersdir=${includedir}/@PACKAGE_NAME@
+
+Name: @PACKAGE_NAME@
+Description: Fork of bash enabling integration into pkgcraft
+Version: @PACKAGE_VERSION@
+Libs: -L${libdir} -l@PACKAGE_NAME@
+Cflags: -I${headersdir} -I${headersdir}/builtins -I${headersdir}/include
diff --git a/variables.c b/variables.c
index 4e6f93bf..96798162 100644
--- a/variables.c
+++ b/variables.c
@@ -1892,9 +1892,9 @@ initialize_dynamic_variables (void)
   v = init_dynamic_array_var ("BASH_SOURCE", get_self, null_array_assign, att_noassign|att_nounset);
   v = init_dynamic_array_var ("BASH_LINENO", get_self, null_array_assign, att_noassign|att_nounset);
 
-  v = init_dynamic_assoc_var ("BASH_CMDS", get_hashcmd, assign_hashcmd, att_nofree);
+  v = init_dynamic_assoc_var ("BASH_CMDS", get_hashcmd, assign_hashcmd, att_noassign);
 #  if defined (ALIAS)
-  v = init_dynamic_assoc_var ("BASH_ALIASES", get_aliasvar, assign_aliasvar, att_nofree);
+  v = init_dynamic_assoc_var ("BASH_ALIASES", get_aliasvar, assign_aliasvar, att_noassign);
 #  endif
 #endif
 
@@ -4084,6 +4084,19 @@ set_var_read_only (char *name)
   VSETATTR (entry, att_readonly);
 }
 
+#if defined (BUILD_LIBRARY)
+/* Make the variable associated with NAME be read/write. */
+void
+set_var_read_write (char *name)
+{
+  SHELL_VAR *entry;
+
+  entry = find_variable (name);
+  if (entry)
+    VUNSETATTR (entry, att_readonly);
+}
+#endif
+
 #ifdef INCLUDE_UNUSED
 /* Make the function associated with NAME be readonly.
    If NAME does not exist, we just punt, like auto_export code below. */
diff --git a/variables.h b/variables.h
index e939e596..5cd12881 100644
--- a/variables.h
+++ b/variables.h
@@ -395,6 +395,9 @@ extern void kill_all_local_variables (void);
 extern HASH_TABLE *copy_vartab (HASH_TABLE *);
 
 extern void set_var_read_only (char *);
+#if defined (BUILD_LIBRARY)
+extern void set_var_read_write (char *);
+#endif
 extern void set_func_read_only (const char *);
 extern void set_var_auto_export (char *);
 extern void set_func_auto_export (const char *);