Add gnulib as a module

@@ -28,7 +28,6 @@ configure
 core
 core
 git-describe
 git-describe
 git-describe.h
 git-describe.h
-gnulib
 libtool
 libtool
 m4
 m4
 mailutils*.tar.*
 mailutils*.tar.*

@@ -4,3 +4,6 @@
 [submodule "doc/imprimatur"]
 [submodule "doc/imprimatur"]
 	path = doc/imprimatur
 	path = doc/imprimatur
 	url = git://git.gnu.org.ua/imprimatur.git
 	url = git://git.gnu.org.ua/imprimatur.git
+[submodule "gnulib"]
+	path = gnulib
+	url = git://git.sv.gnu.org/gnulib.git

@@ -15,7 +15,6 @@ version.
 - M4 <http://www.gnu.org/software/m4/>
 - M4 <http://www.gnu.org/software/m4/>
 - Texinfo <http://www.gnu.org/software/texinfo>
 - Texinfo <http://www.gnu.org/software/texinfo>
 - Wget <http://www.gnu.org/software/wget/>
 - Wget <http://www.gnu.org/software/wget/>
-- Gnulib <http://www.gnu.org/software/gnulib> 
 - Git <http://git.or.cz>
 - Git <http://git.or.cz>
 
 
 * Bootstrapping
 * Bootstrapping

 #! /bin/sh
 #! /bin/sh
+# Print a version string.
+scriptversion=2014-12-08.12; # UTC
 
 
 # Bootstrap this package from checked-out sources.
 # Bootstrap this package from checked-out sources.
 
 
-# Copyright (C) 2003-2008, 2010-2012, 2014-2015 Free Software
-# Foundation, Inc.
+# Copyright (C) 2003-2015 Free Software Foundation, Inc.
 
 
 # This program is free software: you can redistribute it and/or modify
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # it under the terms of the GNU General Public License as published by
@@ -18,7 +19,15 @@
 # You should have received a copy of the GNU General Public License
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-# Written by Paul Eggert.
+# Originally written by Paul Eggert.  The canonical version of this
+# script is maintained as build-aux/bootstrap in gnulib, however, to
+# be useful to your project, you should place a copy of it under
+# version control in the top-level directory of your project.  The
+# intent is that all customization can be done with a bootstrap.conf
+# file also maintained in your version control; gnulib comes with a
+# template build-aux/bootstrap.conf to get you started.
+
+# Please report bugs or propose patches to bug-gnulib@gnu.org.
 
 
 nl='
 nl='
 '
 '
@@ -27,36 +36,77 @@ nl='
 LC_ALL=C
 LC_ALL=C
 export LC_ALL
 export LC_ALL
 
 
+# Ensure that CDPATH is not set.  Otherwise, the output from cd
+# would cause trouble in at least one use below.
+(unset CDPATH) >/dev/null 2>&1 && unset CDPATH
+
 local_gl_dir=gl
 local_gl_dir=gl
 
 
-# Temporary directory names.
-bt='._bootmp'
-bt_regex=`echo "$bt"| sed 's/\./[.]/g'`
-bt2=${bt}2
+# Honour $PERL, but work even if there is none
+PERL="${PERL-perl}"
+
+me=$0
 
 
 usage() {
 usage() {
-  echo >&2 "\
-Usage: $0 [OPTION]...
+  cat <<EOF
+Usage: $me [OPTION]...
 Bootstrap this package from the checked-out sources.
 Bootstrap this package from the checked-out sources.
 
 
 Options:
 Options:
- --gnulib-srcdir=DIRNAME  Specify the local directory where gnulib
+ --gnulib-srcdir=DIRNAME  specify the local directory where gnulib
                           sources reside.  Use this if you already
                           sources reside.  Use this if you already
                           have gnulib sources on your machine, and
                           have gnulib sources on your machine, and
                           do not want to waste your bandwidth downloading
                           do not want to waste your bandwidth downloading
-                          them again.
- --copy                   Copy files instead of creating symbolic links.
- --force                  Attempt to bootstrap even if the sources seem
-                          not to have been checked out.
- --skip-po                Do not download po files.
-
-If the file bootstrap.conf exists in the current working directory, its
+                          them again.  Defaults to \$GNULIB_SRCDIR
+ --bootstrap-sync         if this bootstrap script is not identical to
+                          the version in the local gnulib sources,
+                          update this script, and then restart it with
+                          /bin/sh or the shell \$CONFIG_SHELL
+ --no-bootstrap-sync      do not check whether bootstrap is out of sync
+ --copy                   copy files instead of creating symbolic links
+ --force                  attempt to bootstrap even if the sources seem
+                          not to have been checked out
+ --no-git                 do not use git to update gnulib.  Requires that
+                          --gnulib-srcdir point to a correct gnulib snapshot
+ --skip-po                do not download po files
+
+If the file $me.conf exists in the same directory as this script, its
 contents are read as shell variables to configure the bootstrap.
 contents are read as shell variables to configure the bootstrap.
 
 
+For build prerequisites, environment variables like \$AUTOCONF and \$AMTAR
+are honored.
+
 Running without arguments will suffice in most cases.
 Running without arguments will suffice in most cases.
-"
+EOF
 }
 }
 
 
+# warnf_ FORMAT-STRING ARG1...
+warnf_ ()
+{
+  warnf_format_=$1
+  shift
+  nl='
+'
+  case $* in
+    *$nl*) me_=$(printf "$me"|tr "$nl|" '??')
+       printf "$warnf_format_" "$@" | sed "s|^|$me_: |" ;;
+    *) printf "$me: $warnf_format_" "$@" ;;
+  esac >&2
+}
+
+# warn_ WORD1...
+warn_ ()
+{
+  # If IFS does not start with ' ', set it and emit the warning in a subshell.
+  case $IFS in
+    ' '*) warnf_ '%s\n' "$*";;
+    *)    (IFS=' '; warn_ "$@");;
+  esac
+}
+
+# die WORD1...
+die() { warn_ "$@"; exit 1; }
+
 # Configuration.
 # Configuration.
 
 
 # Name of the Makefile.am
 # Name of the Makefile.am
@@ -68,32 +118,51 @@ gnulib_modules=
 # Any gnulib files needed that are not in modules.
 # Any gnulib files needed that are not in modules.
 gnulib_files=
 gnulib_files=
 
 
+: ${AUTOPOINT=autopoint}
+: ${AUTORECONF=autoreconf}
+
+# A function to be called right after gnulib-tool is run.
+# Override it via your own definition in bootstrap.conf.
+bootstrap_post_import_hook() { :; }
+
+# A function to be called after everything else in this script.
+# Override it via your own definition in bootstrap.conf.
+bootstrap_epilogue() { :; }
+
 # The command to download all .po files for a specified domain into
 # The command to download all .po files for a specified domain into
 # a specified directory.  Fill in the first %s is the domain name, and
 # a specified directory.  Fill in the first %s is the domain name, and
 # the second with the destination directory.  Use rsync's -L and -r
 # the second with the destination directory.  Use rsync's -L and -r
 # options because the latest/%s directory and the .po files within are
 # options because the latest/%s directory and the .po files within are
 # all symlinks.
 # all symlinks.
 po_download_command_format=\
 po_download_command_format=\
-"rsync -Lrtvz 'translationproject.org::tp/latest/%s/' '%s'"
+"rsync --delete --exclude '*.s1' -Lrtvz \
+ 'translationproject.org::tp/latest/%s/' '%s'"
 
 
+# Fallback for downloading .po files (if rsync fails).
+po_download_command_format2=\
+"wget --mirror -nd -q -np -A.po -P '%s' \
+ http://translationproject.org/latest/%s/"
+
+# Prefer a non-empty tarname (4th argument of AC_INIT if given), else
+# fall back to the package name (1st argument with munging)
 extract_package_name='
 extract_package_name='
-  /^AC_INIT(/{
-     /.*,.*,.*, */{
-       s///
-       s/[][]//g
-       s/)$//
+  /^AC_INIT(\[*/{
+     s///
+     /^[^,]*,[^,]*,[^,]*,[ []*\([^][ ,)]\)/{
+       s//\1/
+       s/[],)].*//
        p
        p
        q
        q
      }
      }
-     s/AC_INIT(\[*//
-     s/]*,.*//
+     s/[],)].*//
      s/^GNU //
      s/^GNU //
      y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/
      y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/
-     s/[^A-Za-z0-9_]/-/g
+     s/[^abcdefghijklmnopqrstuvwxyz0123456789_]/-/g
      p
      p
   }
   }
 '
 '
-package=`sed -n "$extract_package_name" configure.ac` || exit
+package=$(sed -n "$extract_package_name" configure.ac) \
+  || die 'cannot find package name in configure.ac'
 gnulib_name=lib$package
 gnulib_name=lib$package
 
 
 build_aux=build-aux
 build_aux=build-aux
@@ -101,17 +170,7 @@ source_base=lib
 m4_base=m4
 m4_base=m4
 doc_base=doc
 doc_base=doc
 tests_base=tests
 tests_base=tests
-
-# Extra files from gnulib, which override files from other sources.
-gnulib_extra_files="
-	$build_aux/install-sh
-	$build_aux/mdate-sh
-	$build_aux/texinfo.tex
-	$build_aux/depcomp
-	$build_aux/config.guess
-	$build_aux/config.sub
-	doc/INSTALL
-"
+gnulib_extra_files=''
 
 
 # Additional gnulib-tool options to use.  Use "\newline" to break lines.
 # Additional gnulib-tool options to use.  Use "\newline" to break lines.
 gnulib_tool_option_extras=
 gnulib_tool_option_extras=
@@ -126,7 +185,8 @@ XGETTEXT_OPTIONS='\\\
  --flag=error:3:c-format --flag=error_at_line:5:c-format\\\
  --flag=error:3:c-format --flag=error_at_line:5:c-format\\\
 '
 '
 
 
-# Package bug report address for gettext files
+# Package bug report address and copyright holder for gettext files
+COPYRIGHT_HOLDER='Free Software Foundation, Inc.'
 MSGID_BUGS_ADDRESS=bug-$package@gnu.org
 MSGID_BUGS_ADDRESS=bug-$package@gnu.org
 
 
 # Files we don't want to import.
 # Files we don't want to import.
@@ -145,8 +205,76 @@ copy=false
 # on which version control system (if any) is used in the source directory.
 # on which version control system (if any) is used in the source directory.
 vc_ignore=auto
 vc_ignore=auto
 
 
+# Set this to true in bootstrap.conf to enable --bootstrap-sync by
+# default.
+bootstrap_sync=false
+
+# Use git to update gnulib sources
+use_git=true
+
+check_exists() {
+  if test "$1" = "--verbose"; then
+    ($2 --version </dev/null) >/dev/null 2>&1
+    if test $? -ge 126; then
+      # If not found, run with diagnostics as one may be
+      # presented with env variables to set to find the right version
+      ($2 --version </dev/null)
+    fi
+  else
+    ($1 --version </dev/null) >/dev/null 2>&1
+  fi
+
+  test $? -lt 126
+}
+
+# find_tool ENVVAR NAMES...
+# -------------------------
+# Search for a required program.  Use the value of ENVVAR, if set,
+# otherwise find the first of the NAMES that can be run.
+# If found, set ENVVAR to the program name, die otherwise.
+#
+# FIXME: code duplication, see also gnu-web-doc-update.
+find_tool ()
+{
+  find_tool_envvar=$1
+  shift
+  find_tool_names=$@
+  eval "find_tool_res=\$$find_tool_envvar"
+  if test x"$find_tool_res" = x; then
+    for i; do
+      if check_exists $i; then
+        find_tool_res=$i
+        break
+      fi
+    done
+  fi
+  if test x"$find_tool_res" = x; then
+    warn_ "one of these is required: $find_tool_names;"
+    die   "alternatively set $find_tool_envvar to a compatible tool"
+  fi
+  eval "$find_tool_envvar=\$find_tool_res"
+  eval "export $find_tool_envvar"
+}
+
 # Override the default configuration, if necessary.
 # Override the default configuration, if necessary.
-test -r bootstrap.conf && . ./bootstrap.conf
+# Make sure that bootstrap.conf is sourced from the current directory
+# if we were invoked as "sh bootstrap".
+case "$0" in
+  */*) test -r "$0.conf" && . "$0.conf" ;;
+  *) test -r "$0.conf" && . ./"$0.conf" ;;
+esac
+
+# Extra files from gnulib, which override files from other sources.
+test -z "${gnulib_extra_files}" && \
+  gnulib_extra_files="
+        build-aux/install-sh
+        build-aux/mdate-sh
+        build-aux/texinfo.tex
+        build-aux/depcomp
+        build-aux/config.guess
+        build-aux/config.sub
+        doc/INSTALL
+"
 
 
 if test "$vc_ignore" = auto; then
 if test "$vc_ignore" = auto; then
   vc_ignore=
   vc_ignore=
@@ -165,33 +293,70 @@ do
     usage
     usage
     exit;;
     exit;;
   --gnulib-srcdir=*)
   --gnulib-srcdir=*)
-    GNULIB_SRCDIR=`expr "$option" : '--gnulib-srcdir=\(.*\)'`;;
+    GNULIB_SRCDIR=${option#--gnulib-srcdir=};;
   --skip-po)
   --skip-po)
     SKIP_PO=t;;
     SKIP_PO=t;;
   --force)
   --force)
     checkout_only_file=;;
     checkout_only_file=;;
   --copy)
   --copy)
     copy=true;;
     copy=true;;
+  --bootstrap-sync)
+    bootstrap_sync=true;;
+  --no-bootstrap-sync)
+    bootstrap_sync=false;;
+  --no-git)
+    use_git=false;;
   *)
   *)
-    echo >&2 "$0: $option: unknown option"
-    exit 1;;
+    die "$option: unknown option";;
   esac
   esac
 done
 done
 
 
+$use_git || test -d "$GNULIB_SRCDIR" \
+  || die "Error: --no-git requires --gnulib-srcdir"
+
 if test -n "$checkout_only_file" && test ! -r "$checkout_only_file"; then
 if test -n "$checkout_only_file" && test ! -r "$checkout_only_file"; then
-  echo "$0: Bootstrapping from a non-checked-out distribution is risky." >&2
-  exit 1
+  die "Bootstrapping from a non-checked-out distribution is risky."
 fi
 fi
 
 
-# If $STR is not already on a line by itself in $FILE, insert it,
-# sorting the new contents of the file and replacing $FILE with the result.
-insert_sorted_if_absent() {
+# Strip blank and comment lines to leave significant entries.
+gitignore_entries() {
+  sed '/^#/d; /^$/d' "$@"
+}
+
+# If $STR is not already on a line by itself in $FILE, insert it at the start.
+# Entries are inserted at the start of the ignore list to ensure existing
+# entries starting with ! are not overridden.  Such entries support
+# whitelisting exceptions after a more generic blacklist pattern.
+insert_if_absent() {
   file=$1
   file=$1
   str=$2
   str=$2
   test -f $file || touch $file
   test -f $file || touch $file
-  echo "$str" | sort -u - $file | cmp -s - $file \
-    || echo "$str" | sort -u - $file -o $file \
-    || exit 1
+  test -r $file || die "Error: failed to read ignore file: $file"
+  duplicate_entries=$(gitignore_entries $file | sort | uniq -d)
+  if [ "$duplicate_entries" ] ; then
+    die "Error: Duplicate entries in $file: " $duplicate_entries
+  fi
+  linesold=$(gitignore_entries $file | wc -l)
+  linesnew=$( { echo "$str"; cat $file; } | gitignore_entries | sort -u | wc -l)
+  if [ $linesold != $linesnew ] ; then
+    { echo "$str" | cat - $file > $file.bak && mv $file.bak $file; } \
+      || die "insert_if_absent $file $str: failed"
+  fi
+}
+
+# Adjust $PATTERN for $VC_IGNORE_FILE and insert it with
+# insert_if_absent.
+insert_vc_ignore() {
+  vc_ignore_file="$1"
+  pattern="$2"
+  case $vc_ignore_file in
+  *.gitignore)
+    # A .gitignore entry that does not start with '/' applies
+    # recursively to subdirectories, so prepend '/' to every
+    # .gitignore entry.
+    pattern=$(echo "$pattern" | sed s,^,/,);;
+  esac
+  insert_if_absent "$vc_ignore_file" "$pattern"
 }
 }
 
 
 # Die if there is no AC_CONFIG_AUX_DIR($build_aux) line in configure.ac.
 # Die if there is no AC_CONFIG_AUX_DIR($build_aux) line in configure.ac.
@@ -200,11 +365,8 @@ grep '^[	 ]*AC_CONFIG_AUX_DIR(\['"$build_aux"'\])' configure.ac \
     >/dev/null && found_aux_dir=yes
     >/dev/null && found_aux_dir=yes
 grep '^[	 ]*AC_CONFIG_AUX_DIR('"$build_aux"')' configure.ac \
 grep '^[	 ]*AC_CONFIG_AUX_DIR('"$build_aux"')' configure.ac \
     >/dev/null && found_aux_dir=yes
     >/dev/null && found_aux_dir=yes
-if test $found_aux_dir = no; then
-  echo "$0: expected line not found in configure.ac. Add the following:" >&2
-  echo "  AC_CONFIG_AUX_DIR([$build_aux])" >&2
-  exit 1
-fi
+test $found_aux_dir = yes \
+  || die "configure.ac lacks 'AC_CONFIG_AUX_DIR([$build_aux])'; add it"
 
 
 # If $build_aux doesn't exist, create it now, otherwise some bits
 # If $build_aux doesn't exist, create it now, otherwise some bits
 # below will malfunction.  If creating it, also mark it as ignored.
 # below will malfunction.  If creating it, also mark it as ignored.
@@ -212,76 +374,365 @@ if test ! -d $build_aux; then
   mkdir $build_aux
   mkdir $build_aux
   for dot_ig in x $vc_ignore; do
   for dot_ig in x $vc_ignore; do
     test $dot_ig = x && continue
     test $dot_ig = x && continue
-    insert_sorted_if_absent $dot_ig $build_aux
+    insert_vc_ignore $dot_ig $build_aux
   done
   done
 fi
 fi
 
 
+# Note this deviates from the version comparison in automake
+# in that it treats 1.5 < 1.5.0, and treats 1.4.4a < 1.4-p3a
+# but this should suffice as we won't be specifying old
+# version formats or redundant trailing .0 in bootstrap.conf.
+# If we did want full compatibility then we should probably
+# use m4_version_compare from autoconf.
+sort_ver() { # sort -V is not generally available
+  ver1="$1"
+  ver2="$2"
+
+  # split on '.' and compare each component
+  i=1
+  while : ; do
+    p1=$(echo "$ver1" | cut -d. -f$i)
+    p2=$(echo "$ver2" | cut -d. -f$i)
+    if [ ! "$p1" ]; then
+      echo "$1 $2"
+      break
+    elif [ ! "$p2" ]; then
+      echo "$2 $1"
+      break
+    elif [ ! "$p1" = "$p2" ]; then
+      if [ "$p1" -gt "$p2" ] 2>/dev/null; then # numeric comparison
+        echo "$2 $1"
+      elif [ "$p2" -gt "$p1" ] 2>/dev/null; then # numeric comparison
+        echo "$1 $2"
+      else # numeric, then lexicographic comparison
+        lp=$(printf "$p1\n$p2\n" | LANG=C sort -n | tail -n1)
+        if [ "$lp" = "$p2" ]; then
+          echo "$1 $2"
+        else
+          echo "$2 $1"
+        fi
+      fi
+      break
+    fi
+    i=$(($i+1))
+  done
+}
+
+get_version() {
+  app=$1
+
+  $app --version >/dev/null 2>&1 || { $app --version; return 1; }
+
+  $app --version 2>&1 |
+  sed -n '# Move version to start of line.
+          s/.*[v ]\([0-9]\)/\1/
+
+          # Skip lines that do not start with version.
+          /^[0-9]/!d
+
+          # Remove characters after the version.
+          s/[^.a-z0-9-].*//
+
+          # The first component must be digits only.
+          s/^\([0-9]*\)[a-z-].*/\1/
+
+          #the following essentially does s/5.005/5.5/
+          s/\.0*\([1-9]\)/.\1/g
+          p
+          q'
+}
+
+check_versions() {
+  ret=0
+
+  while read app req_ver; do
+    # We only need libtoolize from the libtool package.
+    if test "$app" = libtool; then
+      app=libtoolize
+    fi
+    # Exempt git if --no-git is in effect.
+    if test "$app" = git; then
+      $use_git || continue
+    fi
+    # Honor $APP variables ($TAR, $AUTOCONF, etc.)
+    appvar=$(echo $app | LC_ALL=C tr '[a-z]-' '[A-Z]_')
+    test "$appvar" = TAR && appvar=AMTAR
+    case $appvar in
+        GZIP) ;; # Do not use $GZIP:  it contains gzip options.
+        PERL::*) ;; # Keep perl modules as-is
+        *) eval "app=\${$appvar-$app}" ;;
+    esac
+
+    # Handle the still-experimental Automake-NG programs specially.
+    # They remain named as the mainstream Automake programs ("automake",
+    # and "aclocal") to avoid gratuitous incompatibilities with
+    # pre-existing usages (by, say, autoreconf, or custom autogen.sh
+    # scripts), but correctly identify themselves (as being part of
+    # "GNU automake-ng") when asked their version.
+    case $app in
+      automake-ng|aclocal-ng)
+        app=${app%-ng}
+        ($app --version | grep '(GNU automake-ng)') >/dev/null 2>&1 || {
+          warn_ "Error: '$app' not found or not from Automake-NG"
+          ret=1
+          continue
+        } ;;
+      # Another check is for perl modules.  These can be written as
+      # e.g. perl::XML::XPath in case of XML::XPath module, etc.
+      perl::*)
+        # Extract module name
+        app="${app#perl::}"
+        if ! $PERL -m"$app" -e 'exit 0' >/dev/null 2>&1; then
+          warn_ "Error: perl module '$app' not found"
+          ret=1
+        fi
+        continue
+        ;;
+    esac
+    if [ "$req_ver" = "-" ]; then
+      # Merely require app to exist; not all prereq apps are well-behaved
+      # so we have to rely on $? rather than get_version.
+      if ! check_exists --verbose $app; then
+        warn_ "Error: '$app' not found"
+        ret=1
+      fi
+    else
+      # Require app to produce a new enough version string.
+      inst_ver=$(get_version $app)
+      if [ ! "$inst_ver" ]; then
+        warn_ "Error: '$app' not found"
+        ret=1
+      else
+        latest_ver=$(sort_ver $req_ver $inst_ver | cut -d' ' -f2)
+        if [ ! "$latest_ver" = "$inst_ver" ]; then
+          warnf_ '%s\n'                                        \
+              "Error: '$app' version == $inst_ver is too old"  \
+              "       '$app' version >= $req_ver is required"
+          ret=1
+        fi
+      fi
+    fi
+  done
+
+  return $ret
+}
+
+print_versions() {
+  echo "Program    Min_version"
+  echo "----------------------"
+  printf %s "$buildreq"
+  echo "----------------------"
+  # can't depend on column -t
+}
+
+# Find sha1sum, named gsha1sum on MacPorts, shasum on Mac OS X 10.6.
+# Also find the compatible sha1 utility on the BSDs
+if test x"$SKIP_PO" = x; then
+  find_tool SHA1SUM sha1sum gsha1sum shasum sha1
+fi
+
+use_libtool=0
+# We'd like to use grep -E, to see if any of LT_INIT,
+# AC_PROG_LIBTOOL, AM_PROG_LIBTOOL is used in configure.ac,
+# but that's not portable enough (e.g., for Solaris).
+grep '^[	 ]*A[CM]_PROG_LIBTOOL' configure.ac >/dev/null \
+  && use_libtool=1
+grep '^[	 ]*LT_INIT' configure.ac >/dev/null \
+  && use_libtool=1
+if test $use_libtool = 1; then
+  find_tool LIBTOOLIZE glibtoolize libtoolize
+fi
+
+# gnulib-tool requires at least automake and autoconf.
+# If either is not listed, add it (with minimum version) as a prerequisite.
+case $buildreq in
+  *automake*) ;;
+  *) buildreq="automake 1.9
+$buildreq" ;;
+esac
+case $buildreq in
+  *autoconf*) ;;
+  *) buildreq="autoconf 2.59
+$buildreq" ;;
+esac
+
+# When we can deduce that gnulib-tool will require patch,
+# and when patch is not already listed as a prerequisite, add it, too.
+if test -d "$local_gl_dir" \
+    && ! find "$local_gl_dir" -name '*.diff' -exec false {} +; then
+  case $buildreq in
+    *patch*) ;;
+    *) buildreq="patch -
+$buildreq" ;;
+  esac
+fi
+
+if ! printf "$buildreq" | check_versions; then
+  echo >&2
+  if test -f README-prereq; then
+    die "See README-prereq for how to get the prerequisite programs"
+  else
+    die "Please install the prerequisite programs"
+  fi
+fi
+
+# Warn the user if autom4te appears to be broken; this causes known
+# issues with at least gettext 0.18.3.
+probe=$(echo 'm4_quote([hi])' | autom4te -l M4sugar -t 'm4_quote:$%' -)
+if test "x$probe" != xhi; then
+  warn_ "WARNING: your autom4te wrapper eats stdin;"
+  warn_ "if bootstrap fails, consider upgrading your autotools"
+fi
+
 echo "$0: Bootstrapping from checked-out $package sources..."
 echo "$0: Bootstrapping from checked-out $package sources..."
 
 
+# See if we can use gnulib's git-merge-changelog merge driver.
+if $use_git && test -d .git && check_exists git; then
+  if git config merge.merge-changelog.driver >/dev/null ; then
+    :
+  elif check_exists git-merge-changelog; then
+    echo "$0: initializing git-merge-changelog driver"
+    git config merge.merge-changelog.name 'GNU-style ChangeLog merge driver'
+    git config merge.merge-changelog.driver 'git-merge-changelog %O %A %B'
+  else
+    echo "$0: consider installing git-merge-changelog from gnulib"
+  fi
+fi
+
+
 cleanup_gnulib() {
 cleanup_gnulib() {
   status=$?
   status=$?
-  rm -fr gnulib
+  rm -fr "$gnulib_path"
   exit $status
   exit $status
 }
 }
 
 
-# Get gnulib files.
+git_modules_config () {
+  test -f .gitmodules && git config --file .gitmodules "$@"
+}
+
+if $use_git; then
+  gnulib_path=$(git_modules_config submodule.gnulib.path)
+  test -z "$gnulib_path" && gnulib_path=gnulib
+fi
+
+# Get gnulib files.  Populate $GNULIB_SRCDIR, possibly updating a
+# submodule, for use in the rest of the script.
 
 
 case ${GNULIB_SRCDIR--} in
 case ${GNULIB_SRCDIR--} in
 -)
 -)
-  if [ ! -d gnulib ]; then
+  # Note that $use_git is necessarily true in this case.
+  if git_modules_config submodule.gnulib.url >/dev/null; then
+    echo "$0: getting gnulib files..."
+    git submodule init -- "$gnulib_path" || exit $?
+    git submodule update -- "$gnulib_path" || exit $?
+
+  elif [ ! -d "$gnulib_path" ]; then
     echo "$0: getting gnulib files..."
     echo "$0: getting gnulib files..."
 
 
     trap cleanup_gnulib 1 2 13 15
     trap cleanup_gnulib 1 2 13 15
 
 
-    git clone --depth 2 git://git.sv.gnu.org/gnulib ||
+    shallow=
+    git clone -h 2>&1 | grep -- --depth > /dev/null && shallow='--depth 2'
+    git clone $shallow git://git.sv.gnu.org/gnulib "$gnulib_path" ||
       cleanup_gnulib
       cleanup_gnulib
 
 
     trap - 1 2 13 15
     trap - 1 2 13 15
   fi
   fi
-  GNULIB_SRCDIR=gnulib
+  GNULIB_SRCDIR=$gnulib_path
+  ;;
+*)
+  # Use GNULIB_SRCDIR directly or as a reference.
+  if $use_git && test -d "$GNULIB_SRCDIR"/.git && \
+        git_modules_config submodule.gnulib.url >/dev/null; then
+    echo "$0: getting gnulib files..."
+    if git submodule -h|grep -- --reference > /dev/null; then
+      # Prefer the one-liner available in git 1.6.4 or newer.
+      git submodule update --init --reference "$GNULIB_SRCDIR" \
+        "$gnulib_path" || exit $?
+    else
+      # This fallback allows at least git 1.5.5.
+      if test -f "$gnulib_path"/gnulib-tool; then
+        # Since file already exists, assume submodule init already complete.
+        git submodule update -- "$gnulib_path" || exit $?
+      else
+        # Older git can't clone into an empty directory.
+        rmdir "$gnulib_path" 2>/dev/null
+        git clone --reference "$GNULIB_SRCDIR" \
+          "$(git_modules_config submodule.gnulib.url)" "$gnulib_path" \
+          && git submodule init -- "$gnulib_path" \
+          && git submodule update -- "$gnulib_path" \
+          || exit $?
+      fi
+    fi
+    GNULIB_SRCDIR=$gnulib_path
+  fi
+  ;;
 esac
 esac
 
 
+# $GNULIB_SRCDIR now points to the version of gnulib to use, and
+# we no longer need to use git or $gnulib_path below here.
+
+if $bootstrap_sync; then
+  cmp -s "$0" "$GNULIB_SRCDIR/build-aux/bootstrap" || {
+    echo "$0: updating bootstrap and restarting..."
+    case $(sh -c 'echo "$1"' -- a) in
+      a) ignored=--;;
+      *) ignored=ignored;;
+    esac
+    exec sh -c \
+      'cp "$1" "$2" && shift && exec "${CONFIG_SHELL-/bin/sh}" "$@"' \
+      $ignored "$GNULIB_SRCDIR/build-aux/bootstrap" \
+      "$0" "$@" --no-bootstrap-sync
+  }
+fi
+
 gnulib_tool=$GNULIB_SRCDIR/gnulib-tool
 gnulib_tool=$GNULIB_SRCDIR/gnulib-tool
-<$gnulib_tool || exit
+<$gnulib_tool || exit $?
 
 
 # Get translations.
 # Get translations.
 
 
 download_po_files() {
 download_po_files() {
   subdir=$1
   subdir=$1
   domain=$2
   domain=$2
-  echo "$0: getting translations into $subdir for $domain..."
-  cmd=`printf "$po_download_command_format" "$domain" "$subdir"`
+  echo "$me: getting translations into $subdir for $domain..."
+  cmd=$(printf "$po_download_command_format" "$domain" "$subdir")
+  eval "$cmd" && return
+  # Fallback to HTTP.
+  cmd=$(printf "$po_download_command_format2" "$subdir" "$domain")
   eval "$cmd"
   eval "$cmd"
 }
 }
 
 
-# Download .po files to $po_dir/.reference and copy only the new
+# Mirror .po files to $po_dir/.reference and copy only the new
 # or modified ones into $po_dir.  Also update $po_dir/LINGUAS.
 # or modified ones into $po_dir.  Also update $po_dir/LINGUAS.
+# Note po files that exist locally only are left in $po_dir but will
+# not be included in LINGUAS and hence will not be distributed.
 update_po_files() {
 update_po_files() {
   # Directory containing primary .po files.
   # Directory containing primary .po files.
   # Overwrite them only when we're sure a .po file is new.
   # Overwrite them only when we're sure a .po file is new.
   po_dir=$1
   po_dir=$1
   domain=$2
   domain=$2
 
 
-  # Download *.po files into this dir.
+  # Mirror *.po files into this dir.
   # Usually contains *.s1 checksum files.
   # Usually contains *.s1 checksum files.
   ref_po_dir="$po_dir/.reference"
   ref_po_dir="$po_dir/.reference"
 
 
   test -d $ref_po_dir || mkdir $ref_po_dir || return
   test -d $ref_po_dir || mkdir $ref_po_dir || return
   download_po_files $ref_po_dir $domain \
   download_po_files $ref_po_dir $domain \
     && ls "$ref_po_dir"/*.po 2>/dev/null |
     && ls "$ref_po_dir"/*.po 2>/dev/null |
-      sed 's|.*/||; s|\.po$||' > "$po_dir/LINGUAS"
+      sed 's|.*/||; s|\.po$||' > "$po_dir/LINGUAS" || return
 
 
-  langs=`cd $ref_po_dir && echo *.po|sed 's/\.po//g'`
+  langs=$(cd $ref_po_dir && echo *.po | sed 's/\.po//g')
   test "$langs" = '*' && langs=x
   test "$langs" = '*' && langs=x
-  for po in `cd $ref_po_dir && echo *.po|sed 's/\.po//g'`; do
+  for po in $langs; do
     case $po in x) continue;; esac
     case $po in x) continue;; esac
     new_po="$ref_po_dir/$po.po"
     new_po="$ref_po_dir/$po.po"
     cksum_file="$ref_po_dir/$po.s1"
     cksum_file="$ref_po_dir/$po.s1"
     if ! test -f "$cksum_file" ||
     if ! test -f "$cksum_file" ||
-	! test -f "$po_dir/$po.po" ||
-	! sha1sum -c --status "$cksum_file" < "$new_po" > /dev/null; then
-      echo "updated $po_dir/$po.po..."
-      cp "$new_po" "$po_dir/$po.po" && sha1sum < "$new_po" > "$cksum_file"
+        ! test -f "$po_dir/$po.po" ||
+        ! $SHA1SUM -c "$cksum_file" < "$new_po" > /dev/null 2>&1; then
+      echo "$me: updated $po_dir/$po.po..."
+      cp "$new_po" "$po_dir/$po.po" \
+          && $SHA1SUM < "$new_po" > "$cksum_file" || return
     fi
     fi
   done
   done
 }
 }
@@ -306,349 +757,213 @@ symlink_to_dir()
 
 
     # If the destination directory doesn't exist, create it.
     # If the destination directory doesn't exist, create it.
     # This is required at least for "lib/uniwidth/cjk.h".
     # This is required at least for "lib/uniwidth/cjk.h".
-    dst_dir=`dirname "$dst"`
+    dst_dir=$(dirname "$dst")
     if ! test -d "$dst_dir"; then
     if ! test -d "$dst_dir"; then
       mkdir -p "$dst_dir"
       mkdir -p "$dst_dir"
 
 
       # If we've just created a directory like lib/uniwidth,
       # If we've just created a directory like lib/uniwidth,
       # tell version control system(s) it's ignorable.
       # tell version control system(s) it's ignorable.
       # FIXME: for now, this does only one level
       # FIXME: for now, this does only one level
-      parent=`dirname "$dst_dir"`
+      parent=$(dirname "$dst_dir")
       for dot_ig in x $vc_ignore; do
       for dot_ig in x $vc_ignore; do
-	test $dot_ig = x && continue
-	ig=$parent/$dot_ig
-	insert_sorted_if_absent $ig `echo "$dst_dir"|sed 's,.*/,,'`
+        test $dot_ig = x && continue
+        ig=$parent/$dot_ig
+        insert_vc_ignore $ig "${dst_dir##*/}"
       done
       done
     fi
     fi
 
 
     if $copy; then
     if $copy; then
       {
       {
-	test ! -h "$dst" || {
-	  echo "$0: rm -f $dst" &&
-	  rm -f "$dst"
-	}
+        test ! -h "$dst" || {
+          echo "$me: rm -f $dst" &&
+          rm -f "$dst"
+        }
       } &&
       } &&
       test -f "$dst" &&
       test -f "$dst" &&
       cmp -s "$src" "$dst" || {
       cmp -s "$src" "$dst" || {
-	echo "$0: cp -fp $src $dst" &&
-	cp -fp "$src" "$dst"
+        echo "$me: cp -fp $src $dst" &&
+        cp -fp "$src" "$dst"
       }
       }
     else
     else
+      # Leave any existing symlink alone, if it already points to the source,
+      # so that broken build tools that care about symlink times
+      # aren't confused into doing unnecessary builds.  Conversely, if the
+      # existing symlink's time stamp is older than the source, make it afresh,
+      # so that broken tools aren't confused into skipping needed builds.  See
+      # <http://lists.gnu.org/archive/html/bug-gnulib/2011-05/msg00326.html>.
       test -h "$dst" &&
       test -h "$dst" &&
-      src_ls=`ls -diL "$src" 2>/dev/null` && set $src_ls && src_i=$1 &&
-      dst_ls=`ls -diL "$dst" 2>/dev/null` && set $dst_ls && dst_i=$1 &&
-      test "$src_i" = "$dst_i" || {
-	dot_dots=
-	case $src in
-	/*) ;;
-	*)
-	  case /$dst/ in
-	  *//* | */../* | */./* | /*/*/*/*/*/)
-	     echo >&2 "$0: invalid symlink calculation: $src -> $dst"
-	     exit 1;;
-	  /*/*/*/*/)	dot_dots=../../../;;
-	  /*/*/*/)	dot_dots=../../;;
-	  /*/*/)	dot_dots=../;;
-	  esac;;
-	esac
-
-	echo "$0: ln -fs $dot_dots$src $dst" &&
-	ln -fs "$dot_dots$src" "$dst"
+      src_ls=$(ls -diL "$src" 2>/dev/null) && set $src_ls && src_i=$1 &&
+      dst_ls=$(ls -diL "$dst" 2>/dev/null) && set $dst_ls && dst_i=$1 &&
+      test "$src_i" = "$dst_i" &&
+      both_ls=$(ls -dt "$src" "$dst") &&
+      test "X$both_ls" = "X$dst$nl$src" || {
+        dot_dots=
+        case $src in
+        /*) ;;
+        *)
+          case /$dst/ in
+          *//* | */../* | */./* | /*/*/*/*/*/)
+             die "invalid symlink calculation: $src -> $dst";;
+          /*/*/*/*/)    dot_dots=../../../;;
+          /*/*/*/)      dot_dots=../../;;
+          /*/*/)        dot_dots=../;;
+          esac;;
+        esac
+
+        echo "$me: ln -fs $dot_dots$src $dst" &&
+        ln -fs "$dot_dots$src" "$dst"
       }
       }
     fi
     fi
   }
   }
 }
 }
 
 
-cp_mark_as_generated()
-{
-  cp_src=$1
-  cp_dst=$2
-
-  if cmp -s "$cp_src" "$GNULIB_SRCDIR/$cp_dst"; then
-    symlink_to_dir "$GNULIB_SRCDIR" "$cp_dst"
-  elif cmp -s "$cp_src" "$local_gl_dir/$cp_dst"; then
-    symlink_to_dir $local_gl_dir "$cp_dst"
-  else
-    case $cp_dst in
-      *.[ch])             c1='/* '; c2=' */';;
-      *.texi)             c1='@c '; c2=     ;;
-      *.m4|*/Make*|Make*) c1='# ' ; c2=     ;;
-      *)                  c1=     ; c2=     ;;
-    esac
-
-    # If the destination directory doesn't exist, create it.
-    # This is required at least for "lib/uniwidth/cjk.h".
-    dst_dir=`dirname "$cp_dst"`
-    test -d "$dst_dir" || mkdir -p "$dst_dir"
-
-    if test -z "$c1"; then
-      cmp -s "$cp_src" "$cp_dst" || {
-	echo "$0: cp -f $cp_src $cp_dst" &&
-	rm -f "$cp_dst" &&
-	sed "s!$bt_regex/!!g" "$cp_src" > "$cp_dst"
-      }
-    else
-      # Copy the file first to get proper permissions if it
-      # doesn't already exist.  Then overwrite the copy.
-      cp "$cp_src" "$cp_dst-t" &&
-      (
-	echo "$c1-*- buffer-read-only: t -*- vi: set ro:$c2" &&
-	echo "${c1}DO NOT EDIT! GENERATED AUTOMATICALLY!$c2" &&
-	sed "s!$bt_regex/!!g" "$cp_src"
-      ) > $cp_dst-t &&
-      if cmp -s "$cp_dst-t" "$cp_dst"; then
-	rm -f "$cp_dst-t"
-      else
-	echo "$0: cp $cp_src $cp_dst # with edits" &&
-	mv -f "$cp_dst-t" "$cp_dst"
-      fi
-    fi
-  fi
-}
-
 version_controlled_file() {
 version_controlled_file() {
-  dir=$1
+  parent=$1
   file=$2
   file=$2
-  found=no
-  if test -d CVS; then
-    grep -F "/$file/" $dir/CVS/Entries 2>/dev/null |
-	     grep '^/[^/]*/[0-9]' > /dev/null && found=yes
-  elif test -d .git; then
-    git rm -n "$dir/$file" > /dev/null 2>&1 && found=yes
+  if test -d .git; then
+    git rm -n "$file" > /dev/null 2>&1
   elif test -d .svn; then
   elif test -d .svn; then
-    svn log -r HEAD "$dir/$file" > /dev/null 2>&1 && found=yes  
+    svn log -r HEAD "$file" > /dev/null 2>&1
+  elif test -d CVS; then
+    grep -F "/${file##*/}/" "$parent/CVS/Entries" 2>/dev/null |
+             grep '^/[^/]*/[0-9]' > /dev/null
   else
   else
-    echo "$0: no version control for $dir/$file?" >&2
+    warn_ "no version control for $file?"
+    false
   fi
   fi
-  test $found = yes
 }
 }
 
 
-# AWK program to convert a Makefile(.am) file rules to Automake 1.11
-# silent mode.
-silent_rules_prog='
-# state = 0 - outside rules
-# state = 1 - first line inside a rule
-# state = 2 - subsequent lines inside a rule
-# cont  = 1 - this line is a continuation of the previous one
-# defn  = 1 - insert AM_V_GEN/AM_V_at definitions after the initail comment
-# Print comment lines
-/^[ \t]*#/ { print; next }
-# Insert AM_V_ definitions, if required.
-state == 0 && defn == 1 {
-   print "AM_DEFAULT_VERBOSITY=0" # FIXME
-   print "AM_V_GEN = $(am__v_GEN_$(V))"
-   print "am__v_GEN_ = $(am__v_GEN_$(AM_DEFAULT_VERBOSITY))"
-   print "am__v_GEN_0 = @echo \"  GEN   \" $@;"
-   print "AM_V_at = $(am__v_at_$(V))"
-   print "am__v_at_ = $(am__v_at_$(AM_DEFAULT_VERBOSITY))"
-   print "am__v_at_0 = @"
-   defn = 0
-}
-# Start of a rule
-/^[^ \t].*:/ { print; state = 1; cont = 0; next }
-# First action within the rule
-state == 1 && /^\t/ {
-	# Print silent rules without changes.  The second match
-	# is necessary to handle @VAR@ substitutions.
-	if (!(match($1, /^@/) && !match($1, /.@$/)))
-		sub(/^\t[\t ]*/, "&$(AM_V_GEN)")
-	print
-	cont = match($0, /\\$/)
-	state = 2
-	next
-}
-# All non-continuation lines within the rule are prefixed
-# with $(AM_V_at).
-state == 2 && /^\t/ && NF > 0 {
-	if (!cont) 
-		sub(/^\t[\t ]*/, "&$(AM_V_at)")
-	print
-	cont = match($0, /\\$/)
-	next
-}
-# Everything else is output verbatim
-{ print }
-'
+# NOTE: we have to be careful to run both autopoint and libtoolize
+# before gnulib-tool, since gnulib-tool is likely to provide newer
+# versions of files "installed" by these two programs.
+# Then, *after* gnulib-tool (see below), we have to be careful to
+# run autoreconf in such a way that it does not run either of these
+# two just-pre-run programs.
+
+# Import from gettext.
+with_gettext=yes
+grep '^[	 ]*AM_GNU_GETTEXT_VERSION(' configure.ac >/dev/null || \
+    with_gettext=no
 
 
-silent_rules=yes
-grep 'AM_SILENT_RULES' configure.ac > /dev/null ||
-  grep '^[	]*AM_INIT_AUTOMAKE([^)][^)]*silent-rules' configure.ac > /dev/null ||
-  silent_rules=no
+if test $with_gettext = yes || test $use_libtool = 1; then
 
 
-silentize() {
-  if test "$silent_rules" = yes; then
-    case $1 in
-    *.am)  defn=0;;
-    *.in)  defn=1;;
+  tempbase=.bootstrap$$
+  trap "rm -f $tempbase.0 $tempbase.1" 1 2 13 15
+
+  > $tempbase.0 > $tempbase.1 &&
+  find . ! -type d -print | sort > $tempbase.0 || exit
+
+  if test $with_gettext = yes; then
+    # Released autopoint has the tendency to install macros that have been
+    # obsoleted in current gnulib, so run this before gnulib-tool.
+    echo "$0: $AUTOPOINT --force"
+    $AUTOPOINT --force || exit
+  fi
+
+  # Autoreconf runs aclocal before libtoolize, which causes spurious
+  # warnings if the initial aclocal is confused by the libtoolized
+  # (or worse out-of-date) macro directory.
+  # libtoolize 1.9b added the --install option; but we support back
+  # to libtoolize 1.5.22, where the install action was default.
+  if test $use_libtool = 1; then
+    install=
+    case $($LIBTOOLIZE --help) in
+      *--install*) install=--install ;;
     esac
     esac
-    awk -v defn=$defn "$silent_rules_prog" $1 > ${1}-t &&
-    mv ${1}-t $1
+    echo "running: $LIBTOOLIZE $install --copy"
+    $LIBTOOLIZE $install --copy
   fi
   fi
-}
 
 
-slurp() {
-  for dir in . `(cd $1 && find * -type d -print)`; do
-    copied=
-    sep=
-    for file in `ls -a $1/$dir`; do
-      case $file in
-      .|..) continue;;
-      .*) continue;; # FIXME: should all file names starting with "." be ignored?
-      esac
-      test -d $1/$dir/$file && continue
-      for excluded_file in $excluded_files; do
-	test "$dir/$file" = "$excluded_file" && continue 2
+  find . ! -type d -print | sort >$tempbase.1
+  old_IFS=$IFS
+  IFS=$nl
+  for file in $(comm -13 $tempbase.0 $tempbase.1); do
+    IFS=$old_IFS
+    parent=${file%/*}
+    version_controlled_file "$parent" "$file" || {
+      for dot_ig in x $vc_ignore; do
+        test $dot_ig = x && continue
+        ig=$parent/$dot_ig
+        insert_vc_ignore "$ig" "${file##*/}"
       done
       done
-      if test $file = Makefile.am; then
-        copied=$copied${sep}$gnulib_mk; sep=$nl
-	remove_intl='/^[^#].*\/intl/s/^/#/;'"s!$bt_regex/!!g"
-        sed "$remove_intl" $1/$dir/$file | cmp -s - $dir/$gnulib_mk || {
-	  echo "$0: Copying $1/$dir/$file to $dir/$gnulib_mk ..." &&
-	  rm -f $dir/$gnulib_mk &&
-	  sed "$remove_intl" $1/$dir/$file >$dir/$gnulib_mk
-	}
-      elif { test "${2+set}" = set && test -r $2/$dir/$file; } ||
-	   version_controlled_file $dir $file; then
-	echo "$0: $dir/$file overrides $1/$dir/$file"
-      else
-	copied=$copied$sep$file; sep=$nl
-	if test $file = gettext.m4; then
-	  echo "$0: patching m4/gettext.m4 to remove need for intl/* ..."
-	  rm -f $dir/$file
-	  sed '
-	    /^AC_DEFUN(\[AM_INTL_SUBDIR],/,/^]/c\
-	      AC_DEFUN([AM_INTL_SUBDIR], [
-	    /^AC_DEFUN(\[gt_INTL_SUBDIR_CORE],/,/^]/c\
-	      AC_DEFUN([gt_INTL_SUBDIR_CORE], [])
-	    $a\
-	      AC_DEFUN([gl_LOCK_EARLY], [])
-	  ' $1/$dir/$file >$dir/$file
-	else
-	  cp_mark_as_generated $1/$dir/$file $dir/$file
-	fi
-      fi || exit
-    done
-
-    for dot_ig in x $vc_ignore; do
-      test $dot_ig = x && continue
-      ig=$dir/$dot_ig
-      if test -n "$copied"; then
-	insert_sorted_if_absent $ig "$copied"
-	# If an ignored file name ends with .in.h, then also add
-	# the name with just ".h".  Many gnulib headers are generated,
-	# e.g., stdint.in.h -> stdint.h, dirent.in.h ->..., etc.
-	# Likewise for .gperf -> .h, .y -> .c, and .sin -> .sed
-	f=`echo "$copied"|sed 's/\.in\.h$/.h/;s/\.sin$/.sed/;s/\.y$/.c/;s/\.gperf$/.h/'`
-	insert_sorted_if_absent $ig "$f"
-
-	# For files like sys_stat.in.h and sys_time.in.h, record as
-	# ignorable the directory we might eventually create: sys/.
-	f=`echo "$copied"|sed 's/sys_.*\.in\.h$/sys/'`
-	insert_sorted_if_absent $ig "$f"
-      fi
-    done
+    }
   done
   done
-}
-
+  IFS=$old_IFS
 
 
-# Create boot temporary directories to import from gnulib and gettext.
-rm -fr $bt $bt2 &&
-mkdir $bt $bt2 || exit
+  rm -f $tempbase.0 $tempbase.1
+  trap - 1 2 13 15
+fi
 
 
 # Import from gnulib.
 # Import from gnulib.
 
 
 gnulib_tool_options="\
 gnulib_tool_options="\
  --import\
  --import\
  --no-changelog\
  --no-changelog\
- --aux-dir $bt/$build_aux\
- --doc-base $bt/$doc_base\
+ --aux-dir $build_aux\
+ --doc-base $doc_base\
  --lib $gnulib_name\
  --lib $gnulib_name\
- --m4-base $bt/$m4_base/\
- --source-base $bt/$source_base/\
- --tests-base $bt/$tests_base\
+ --m4-base $m4_base/\
+ --source-base $source_base/\
+ --tests-base $tests_base\
  --local-dir $local_gl_dir\
  --local-dir $local_gl_dir\
  $gnulib_tool_option_extras\
  $gnulib_tool_option_extras\
 "
 "
+if test $use_libtool = 1; then
+  case "$gnulib_tool_options " in
+    *' --libtool '*) ;;
+    *) gnulib_tool_options="$gnulib_tool_options --libtool" ;;
+  esac
+fi
 echo "$0: $gnulib_tool $gnulib_tool_options --import ..."
 echo "$0: $gnulib_tool $gnulib_tool_options --import ..."
-$gnulib_tool $gnulib_tool_options --import $gnulib_modules &&
-slurp $bt || exit
+$gnulib_tool $gnulib_tool_options --import $gnulib_modules \
+  || die "gnulib-tool failed"
 
 
 for file in $gnulib_files; do
 for file in $gnulib_files; do
-  symlink_to_dir "$GNULIB_SRCDIR" $file || exit
+  symlink_to_dir "$GNULIB_SRCDIR" $file \
+    || die "failed to symlink $file"
 done
 done
 
 
+bootstrap_post_import_hook \
+  || die "bootstrap_post_import_hook failed"
 
 
-# Import from gettext.
-with_gettext=yes
-grep '^[	 ]*AM_GNU_GETTEXT_VERSION(' configure.ac >/dev/null || \
-    with_gettext=no
-
-if test $with_gettext = yes; then
-  echo "$0: (cd $bt2; autopoint) ..."
-  cp configure.ac $bt2 &&
-  (cd $bt2 && autopoint && rm configure.ac) &&
-  slurp $bt2 $bt || exit
-
-  rm -fr $bt $bt2 || exit
-fi
-
-# Coreutils is unusual in that it generates some of its test-related
-# Makefile.am files.  That must be done before invoking automake.
-mam_template=tests/Makefile.am.in
-if test -f $mam_template; then
-  PERL=perl
-  for tool in cut head join pr sort tac tail test tr uniq wc; do
-    m=tests/$tool/Makefile.am
-    t=${m}t
-    rm -f $m $t
-    sed -n '1,/^##test-files-begin/p' $mam_template > $t
-    echo "x = $tool" >> $t
-    srcdir=tests/$tool
-    $PERL -I$srcdir -w -- tests/mk-script $srcdir --list >> $t
-    sed -n '/^##test-files-end/,$p' $mam_template >> $t
-    chmod -w $t
-    mv $t $m
-  done
-fi
-
-# Remove any dangling symlink matching "*.m4" in the gnulib-populated
-# $m4_base directory, since such a file would cause aclocal to fail.
+# Remove any dangling symlink matching "*.m4" or "*.[ch]" in some
+# gnulib-populated directories.  Such .m4 files would cause aclocal to fail.
 # The following requires GNU find 4.2.3 or newer.  Considering the usual
 # The following requires GNU find 4.2.3 or newer.  Considering the usual
 # portability constraints of this script, that may seem a very demanding
 # portability constraints of this script, that may seem a very demanding
 # requirement, but it should be ok.  Ignore any failure, which is fine,
 # requirement, but it should be ok.  Ignore any failure, which is fine,
 # since this is only a convenience to help developers avoid the relatively
 # since this is only a convenience to help developers avoid the relatively
 # unusual case in which a symlinked-to .m4 file is git-removed from gnulib
 # unusual case in which a symlinked-to .m4 file is git-removed from gnulib
 # between successive runs of this script.
 # between successive runs of this script.
-find "$m4_base" -name '*.m4' -depth -type l -xtype l -delete > /dev/null 2>&1
-
-# Reconfigure, getting other files.
-
-aclocal_flags=`sed -n 's/ACLOCAL_AMFLAGS *=//p' Makefile.am`
-for command in \
-  libtool \
-  "aclocal --force $aclocal_flags" \
-  'autoconf --force' \
-  'autoheader --force' \
-  'automake --add-missing --copy --force-missing';
-do
-  if test "$command" = libtool; then
-    grep '^[	 ]*AM_PROG_LIBTOOL\>' configure.ac >/dev/null ||
-      continue
-    command='libtoolize -c -f'
-  fi
-  echo "$0: $command ..."
-  $command || exit
-done
+find "$m4_base" "$source_base" \
+  -depth \( -name '*.m4' -o -name '*.[ch]' \) \
+  -type l -xtype l -delete > /dev/null 2>&1
+
+# Invoke autoreconf with --force --install to ensure upgrades of tools
+# such as ylwrap.
+AUTORECONFFLAGS="--verbose --install --force -I $m4_base $ACLOCAL_FLAGS"
+
+# Some systems (RHEL 5) are using ancient autotools, for which the
+# --no-recursive option had not been invented.  Detect that lack and
+# omit the option when it's not supported.  FIXME in 2017: remove this
+# hack when RHEL 5 autotools are updated, or when they become irrelevant.
+case $($AUTORECONF --help) in
+  *--no-recursive*) AUTORECONFFLAGS="$AUTORECONFFLAGS --no-recursive";;
+esac
 
 
+# Tell autoreconf not to invoke autopoint or libtoolize; they were run above.
+echo "running: AUTOPOINT=true LIBTOOLIZE=true $AUTORECONF $AUTORECONFFLAGS"
+AUTOPOINT=true LIBTOOLIZE=true $AUTORECONF $AUTORECONFFLAGS \
+  || die "autoreconf failed"
 
 
 # Get some extra files from gnulib, overriding existing files.
 # Get some extra files from gnulib, overriding existing files.
 for file in $gnulib_extra_files; do
 for file in $gnulib_extra_files; do
   case $file in
   case $file in
   */INSTALL) dst=INSTALL;;
   */INSTALL) dst=INSTALL;;
-  build-aux/*) dst=$build_aux/`expr "$file" : 'build-aux/\(.*\)'`;;
+  build-aux/*) dst=$build_aux/${file#build-aux/};;
   *) dst=$file;;
   *) dst=$file;;
   esac
   esac
-  symlink_to_dir "$GNULIB_SRCDIR" $file $dst || exit
+  symlink_to_dir "$GNULIB_SRCDIR" $file $dst \
+    || die "failed to symlink $file"
 done
 done
 
 
 if test $with_gettext = yes; then
 if test $with_gettext = yes; then
@@ -657,15 +972,27 @@ if test $with_gettext = yes; then
   rm -f po/Makevars
   rm -f po/Makevars
   sed '
   sed '
     /^EXTRA_LOCALE_CATEGORIES *=/s/=.*/= '"$EXTRA_LOCALE_CATEGORIES"'/
     /^EXTRA_LOCALE_CATEGORIES *=/s/=.*/= '"$EXTRA_LOCALE_CATEGORIES"'/
-    /^MSGID_BUGS_ADDRESS *=/s/=.*/= '"$MSGID_BUGS_ADDRESS"'/
     /^COPYRIGHT_HOLDER *=/s/=.*/= '"$COPYRIGHT_HOLDER"'/
     /^COPYRIGHT_HOLDER *=/s/=.*/= '"$COPYRIGHT_HOLDER"'/
+    /^MSGID_BUGS_ADDRESS *=/s|=.*|= '"$MSGID_BUGS_ADDRESS"'|
     /^XGETTEXT_OPTIONS *=/{
     /^XGETTEXT_OPTIONS *=/{
       s/$/ \\/
       s/$/ \\/
       a\
       a\
-	  '"$XGETTEXT_OPTIONS"' $${end_of_xgettext_options+}
+          '"$XGETTEXT_OPTIONS"' $${end_of_xgettext_options+}
     }
     }
-  ' po/Makevars.template >po/Makevars
-  silentize po/Makefile.in.in
+  ' po/Makevars.template >po/Makevars \
+    || die 'cannot generate po/Makevars'
+
+  # If the 'gettext' module is in use, grab the latest Makefile.in.in.
+  # If only the 'gettext-h' module is in use, assume autopoint already
+  # put the correct version of this file into place.
+  case $gnulib_modules in
+  *gettext-h*) ;;
+  *gettext*)
+    cp $GNULIB_SRCDIR/build-aux/po/Makefile.in.in po/Makefile.in.in \
+      || die "cannot create po/Makefile.in.in"
+    ;;
+  esac
+
   if test -d runtime-po; then
   if test -d runtime-po; then
     # Similarly for runtime-po/Makevars, but not quite the same.
     # Similarly for runtime-po/Makevars, but not quite the same.
     rm -f runtime-po/Makevars
     rm -f runtime-po/Makevars
@@ -673,17 +1000,27 @@ if test $with_gettext = yes; then
       /^DOMAIN *=.*/s/=.*/= '"$package"'-runtime/
       /^DOMAIN *=.*/s/=.*/= '"$package"'-runtime/
       /^subdir *=.*/s/=.*/= runtime-po/
       /^subdir *=.*/s/=.*/= runtime-po/
       /^MSGID_BUGS_ADDRESS *=/s/=.*/= bug-'"$package"'@gnu.org/
       /^MSGID_BUGS_ADDRESS *=/s/=.*/= bug-'"$package"'@gnu.org/
-      /^COPYRIGHT_HOLDER *=/s/=.*/= '"$COPYRIGHT_HOLDER"'/
       /^XGETTEXT_OPTIONS *=/{
       /^XGETTEXT_OPTIONS *=/{
-	s/$/ \\/
-	a\
-	    '"$XGETTEXT_OPTIONS_RUNTIME"' $${end_of_xgettext_options+}
+        s/$/ \\/
+        a\
+            '"$XGETTEXT_OPTIONS_RUNTIME"' $${end_of_xgettext_options+}
       }
       }
-    ' <po/Makevars.template >runtime-po/Makevars
+    ' po/Makevars.template >runtime-po/Makevars \
+    || die 'cannot generate runtime-po/Makevars'
 
 
     # Copy identical files from po to runtime-po.
     # Copy identical files from po to runtime-po.
     (cd po && cp -p Makefile.in.in *-quot *.header *.sed *.sin ../runtime-po)
     (cd po && cp -p Makefile.in.in *-quot *.header *.sed *.sin ../runtime-po)
   fi
   fi
 fi
 fi
 
 
+bootstrap_epilogue
+
 echo "$0: done.  Now you can run './configure'."
 echo "$0: done.  Now you can run './configure'."
+
+# Local variables:
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
+# End:

+Subproject commit a6aa0b6f74864a94e940b310f6200e18f7d9dcc9