diff --git a/ChangeLog b/ChangeLog
index 741d5313..67364e6f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2001-07-12  Akim Demaille  <akim@epita.fr>
+
+	For some AWK, such as on HPUX 11, `xfoo' does not match `foo|^bar'.
+	Reported by Michael Elizabeth Chastain.
+
+	* autoconf.in: Refuse such AWK.
+	* configure.in: Likewise.
+	* Makefile.am (acversion.m4): Do not use move-if-change this file
+	has dependencies.
+	* doc/autoconf.texi (Fortran 77 Compiler): Some typos.
+
 2001-07-10  Jens Petersen  <petersen@redhat.com>
 
 	* autoscan.in (&scan_makefile): Improve programs regexp to parse
diff --git a/Makefile.am b/Makefile.am
index 34146a70..4aaf88c9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -36,8 +36,9 @@ EXTRA_SCRIPTS = autoscan autoupdate
 # and adapt dependencies once we use a more recent Automake
 
 m4sources =  m4sugar.m4 m4sh.m4  \
+             $(srcdir)/acversion.m4 \
              autoconf.m4 \
-             acgeneral.m4 acoldnames.m4 acspecific.m4 aclang.m4 acversion.m4 \
+             acgeneral.m4 acoldnames.m4 acspecific.m4 aclang.m4 \
              acfunctions.m4 acheaders.m4 actypes.m4
 
 distpkgdataDATA = acfunctions acheaders acidentifiers acmakevars acprograms \
@@ -74,12 +75,10 @@ move_if_change = $(top_srcdir)/config/move-if-change
 # - It is guaranteed (with GNU Make) that when the version in configure.in
 #   is changed, acversion.m4 is built only after the new version number is
 #   propagated to the Makefile.  (Libtool uses the same guarantee.)
-# - Refer to `$(srcdir)/acversion.m4', not `acversion.m4' to help
-#   broken Makes understand it's the same file.
 
 $(srcdir)/acversion.m4: $(srcdir)/acversion.in $(srcdir)/configure.in
 	sed 's,@VERSION\@,$(VERSION),g' $(srcdir)/acversion.in >acversion.tm4
-	$(move_if_change) acversion.tm4 $(srcdir)/acversion.m4
+	mv acversion.tm4 $(srcdir)/acversion.m4
 
 ## INSTALL.  ##
 
@@ -220,7 +219,6 @@ autoconf.m4f: $(m4sources)
 ## Customizing Makefile.maint.  ##
 ## ---------------------------- ##
 
-move_if_change = $(srcdir)/config/move-if-change
 prev_version_file = $(srcdir)/config/prev-version.txt
 
 # Uploading betas.
diff --git a/Makefile.in b/Makefile.in
index 4858b957..b2f823b6 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -83,7 +83,7 @@ EXTRA_SCRIPTS = autoscan autoupdate
 # s/nodistpackageDATA/nodist_pkgdata_DATA/
 # and adapt dependencies once we use a more recent Automake
 
-m4sources = m4sugar.m4 m4sh.m4               autoconf.m4              acgeneral.m4 acoldnames.m4 acspecific.m4 aclang.m4 acversion.m4              acfunctions.m4 acheaders.m4 actypes.m4
+m4sources = m4sugar.m4 m4sh.m4               $(srcdir)/acversion.m4              autoconf.m4              acgeneral.m4 acoldnames.m4 acspecific.m4 aclang.m4              acfunctions.m4 acheaders.m4 actypes.m4
 
 
 distpkgdataDATA = acfunctions acheaders acidentifiers acmakevars acprograms                   aclibraries $(m4sources)
@@ -101,12 +101,13 @@ EXTRA_DIST = ChangeLog.0 ChangeLog.1 ChangeLog.2              BUGS INSTALL.txt
 CLEANFILES = autoconf.m4f              $(bin_SCRIPTS)
 
 
-move_if_change = $(srcdir)/config/move-if-change
+move_if_change = $(top_srcdir)/config/move-if-change
 
 MAINTAINERCLEANFILES = acversion.m4 INSTALL.txt
 
 edit = sed 	-e 's,@SHELL\@,$(SHELL),g' 	-e 's,@PERL\@,$(PERL),g' 	-e 's,@datadir\@,$(pkgdatadir),g' 	-e 's,@bindir\@,$(bindir),g' 	-e 's,@autoconf-name\@,'`echo autoconf | sed '$(transform)'`',g' 	-e 's,@autoheader-name\@,'`echo autoheader | sed '$(transform)'`',g' 	-e 's,@M4\@,$(M4),g' 	-e 's,@AWK\@,$(AWK),g' 	-e 's,@VERSION\@,$(VERSION),g' 	-e 's,@PACKAGE_NAME\@,$(PACKAGE_NAME),g'
 
+
 prev_version_file = $(srcdir)/config/prev-version.txt
 
 # Uploading betas.
@@ -323,6 +324,7 @@ distdir: $(DISTFILES)
 	distdir=`cd $(distdir) && pwd`; \
 	cd $(top_srcdir) \
 	  && $(AUTOMAKE) --include-deps --build-dir=$$here --srcdir-name=$(top_srcdir) --output-dir=$$top_distdir --gnu Makefile
+	$(mkinstalldirs) $(distdir)/$(srcdir)
 	@for file in $(DISTFILES); do \
 	  d=$(srcdir); \
 	  if test -d $$d/$$file; then \
@@ -425,12 +427,10 @@ maintainer-clean-generic clean mostlyclean distclean maintainer-clean
 # - It is guaranteed (with GNU Make) that when the version in configure.in
 #   is changed, acversion.m4 is built only after the new version number is
 #   propagated to the Makefile.  (Libtool uses the same guarantee.)
-# - Refer to `$(srcdir)/acversion.m4', not `acversion.m4' to help
-#   broken Makes understand it's the same file.
 
 $(srcdir)/acversion.m4: $(srcdir)/acversion.in $(srcdir)/configure.in
 	sed 's,@VERSION\@,$(VERSION),g' $(srcdir)/acversion.in >acversion.tm4
-	$(move_if_change) acversion.tm4 $(srcdir)/acversion.m4
+	mv acversion.tm4 $(srcdir)/acversion.m4
 
 # INSTALL is a special case.  Automake seems to have a single name space
 # for both targets and variables.  If we just use INSTALL, then the var
diff --git a/THANKS b/THANKS
index 03f1f006..67efdc58 100644
--- a/THANKS
+++ b/THANKS
@@ -100,6 +100,7 @@ Martin Buchholz             martin@xemacs.org
 Martin Wilck                martin@tropos.de
 Martyn Johnson              Martyn.Johnson@cl.cam.ac.uk
 Matthew D. Langston         langston@SLAC.Stanford.EDU
+Michael Elizabeth Chastain  chastain@cygnus.com
 Michael Schoene             mrs@mlc.de
 Mike Hopkirk                hops@sco.com
 Mike Stump                  mrs@wrs.com
diff --git a/autoconf.in b/autoconf.in
index 59a8947e..75d94c9e 100644
--- a/autoconf.in
+++ b/autoconf.in
@@ -115,11 +115,20 @@ case " $M4 " in
   ;;
 esac
 
+
+# Find a good AWK.
+: ${AWK=@AWK@}
+if echo xfoo | $AWK '/foo|^bar$/ { print }' | grep xfoo >/dev/null; then :; else
+  echo "$me: the regex engine of $AWK is too broken to be used" >&2
+  echo "$me: you might want to install GNU AWK" >&2
+  exit 1
+fi
+
+
 # Variables.
 : ${autoconf_dir=${AC_MACRODIR=@datadir@}}
 test -z "$AC_ACLOCALDIR" &&
   AC_ACLOCALDIR=`(aclocal --print-ac-dir) 2>/dev/null`
-: ${AWK=@AWK@}
 debug=false
 # Trace Autoconf's initialization?
 initialization=false
diff --git a/bin/autoconf.in b/bin/autoconf.in
index 59a8947e..75d94c9e 100644
--- a/bin/autoconf.in
+++ b/bin/autoconf.in
@@ -115,11 +115,20 @@ case " $M4 " in
   ;;
 esac
 
+
+# Find a good AWK.
+: ${AWK=@AWK@}
+if echo xfoo | $AWK '/foo|^bar$/ { print }' | grep xfoo >/dev/null; then :; else
+  echo "$me: the regex engine of $AWK is too broken to be used" >&2
+  echo "$me: you might want to install GNU AWK" >&2
+  exit 1
+fi
+
+
 # Variables.
 : ${autoconf_dir=${AC_MACRODIR=@datadir@}}
 test -z "$AC_ACLOCALDIR" &&
   AC_ACLOCALDIR=`(aclocal --print-ac-dir) 2>/dev/null`
-: ${AWK=@AWK@}
 debug=false
 # Trace Autoconf's initialization?
 initialization=false
diff --git a/configure b/configure
index e783636b..17057966 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by Autoconf 2.50c for GNU Autoconf 2.50c.
+# Generated by Autoconf 2.50 for GNU Autoconf 2.50c.
 #
 # Report bugs to <bug-autoconf@gnu.org>.
 #
@@ -9,19 +9,6 @@
 # This configure script is free software; the Free Software Foundation
 # gives unlimited permission to copy, distribute and modify it.
 
-# Avoid depending upon Character Ranges.
-as_cr_letters='abcdefghijklmnopqrstuvwxyz'
-as_cr_LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
-as_cr_Letters=$as_cr_letters$as_cr_LETTERS
-as_cr_digits='0123456789'
-as_cr_alnum=$as_cr_Letters$as_cr_digits
-
-# Sed expression to map a string onto a valid variable name.
-as_tr_sh="sed y%*+%pp%;s%[^_$as_cr_alnum]%_%g"
-
-# Sed expression to map a string onto a valid CPP name.
-as_tr_cpp="sed y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g"
-
 # Be Bourne compatible
 if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
   emulate sh
@@ -106,6 +93,16 @@ SHELL=${CONFIG_SHELL-/bin/sh}
 # only ac_max_sed_lines should be used.
 : ${ac_max_here_lines=38}
 
+# Avoid depending upon Character Ranges.
+ac_cr_az='abcdefghijklmnopqrstuvwxyz'
+ac_cr_AZ='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+ac_cr_09='0123456789'
+ac_cr_alnum=$ac_cr_az$ac_cr_AZ$ac_cr_09
+
+# Sed expression to map a string onto a valid sh and CPP variable names.
+ac_tr_sh="sed y%*+%pp%;s%[^_$ac_cr_alnum]%_%g"
+ac_tr_cpp="sed y%*$ac_cr_az%P$ac_cr_AZ%;s%[^_$ac_cr_alnum]%_%g"
+
 ac_unique_file="acgeneral.m4"
 
 # Initialize some variables set by options.
@@ -198,7 +195,7 @@ do
   -disable-* | --disable-*)
     ac_feature=`expr "x$ac_option" : 'x-*disable-\(.*\)'`
     # Reject names that are not valid shell variable names.
-    expr "x$ac_feature" : ".*[^-_$as_cr_alnum]" >/dev/null &&
+    expr "x$ac_feature" : ".*[^-_$ac_cr_alnum]" >/dev/null &&
       { echo "$as_me: error: invalid feature name: $ac_feature" >&2
    { (exit 1); exit 1; }; }
     ac_feature=`echo $ac_feature | sed 's/-/_/g'`
@@ -207,7 +204,7 @@ do
   -enable-* | --enable-*)
     ac_feature=`expr "x$ac_option" : 'x-*enable-\([^=]*\)'`
     # Reject names that are not valid shell variable names.
-    expr "x$ac_feature" : ".*[^-_$as_cr_alnum]" >/dev/null &&
+    expr "x$ac_feature" : ".*[^-_$ac_cr_alnum]" >/dev/null &&
       { echo "$as_me: error: invalid feature name: $ac_feature" >&2
    { (exit 1); exit 1; }; }
     ac_feature=`echo $ac_feature | sed 's/-/_/g'`
@@ -389,7 +386,7 @@ do
   -with-* | --with-*)
     ac_package=`expr "x$ac_option" : 'x-*with-\([^=]*\)'`
     # Reject names that are not valid shell variable names.
-    expr "x$ac_package" : ".*[^-_$as_cr_alnum]" >/dev/null &&
+    expr "x$ac_package" : ".*[^-_$ac_cr_alnum]" >/dev/null &&
       { echo "$as_me: error: invalid package name: $ac_package" >&2
    { (exit 1); exit 1; }; }
     ac_package=`echo $ac_package| sed 's/-/_/g'`
@@ -402,7 +399,7 @@ do
   -without-* | --without-*)
     ac_package=`expr "x$ac_option" : 'x-*without-\(.*\)'`
     # Reject names that are not valid shell variable names.
-    expr "x$ac_package" : ".*[^-_$as_cr_alnum]" >/dev/null &&
+    expr "x$ac_package" : ".*[^-_$ac_cr_alnum]" >/dev/null &&
       { echo "$as_me: error: invalid package name: $ac_package" >&2
    { (exit 1); exit 1; }; }
     ac_package=`echo $ac_package | sed 's/-/_/g'`
@@ -434,7 +431,7 @@ Try \`$0 --help' for more information." >&2
   *=*)
     ac_envvar=`expr "x$ac_option" : 'x\([^=]*\)='`
     # Reject names that are not valid shell variable names.
-    expr "x$ac_envvar" : ".*[^_$as_cr_alnum]" >/dev/null &&
+    expr "x$ac_envvar" : ".*[^_$ac_cr_alnum]" >/dev/null &&
       { echo "$as_me: error: invalid variable name: $ac_envvar" >&2
    { (exit 1); exit 1; }; }
     ac_optarg=`echo "$ac_optarg" | sed "s/'/'\\\\\\\\''/g"`
@@ -444,7 +441,7 @@ Try \`$0 --help' for more information." >&2
   *)
     # FIXME: should be removed in autoconf 3.0.
     echo "$as_me: WARNING: you should use --build, --host, --target" >&2
-    expr "x$ac_option" : ".*[^-._$as_cr_alnum]" >/dev/null &&
+    expr "x$ac_option" : ".*[^-._$ac_cr_alnum]" >/dev/null &&
       echo "$as_me: WARNING: invalid host type: $ac_option" >&2
     : ${build_alias=$ac_option} ${host_alias=$ac_option} ${target_alias=$ac_option}
     ;;
@@ -458,24 +455,15 @@ if test -n "$ac_prev"; then
    { (exit 1); exit 1; }; }
 fi
 
-# Be sure to have absolute paths.
-for ac_var in exec_prefix prefix
-do
-  eval ac_val=$`echo $ac_var`
-  case $ac_val in
-    [\\/$]* | ?:[\\/]* | NONE | '' ) ;;
-    *)  { echo "$as_me: error: expected an absolute path for --$ac_var: $ac_val" >&2
-   { (exit 1); exit 1; }; };;
-  esac
-done
-
 # Be sure to have absolute paths.
 for ac_var in bindir sbindir libexecdir datadir sysconfdir sharedstatedir \
-              localstatedir libdir includedir oldincludedir infodir mandir
+              localstatedir libdir includedir oldincludedir infodir mandir \
+              exec_prefix prefix
 do
   eval ac_val=$`echo $ac_var`
   case $ac_val in
     [\\/$]* | ?:[\\/]* ) ;;
+    NONE ) ;;
     *)  { echo "$as_me: error: expected an absolute path for --$ac_var: $ac_val" >&2
    { (exit 1); exit 1; }; };;
   esac
@@ -657,7 +645,7 @@ test -n "$ac_init_help" && exit 0
 if $ac_init_version; then
   cat <<\EOF
 GNU Autoconf configure 2.50c
-generated by GNU Autoconf 2.50c
+generated by GNU Autoconf 2.50
 
 Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001
 Free Software Foundation, Inc.
@@ -672,7 +660,7 @@ This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
 It was created by GNU Autoconf $as_me 2.50c, which was
-generated by GNU Autoconf 2.50c.  Invocation command line was
+generated by GNU Autoconf 2.50.  Invocation command line was
 
   $ $0 $@
 
@@ -751,11 +739,11 @@ trap 'exit_status=$?
     *ac_space=\ *)
       sed -n \
         "s/'"'"'/'"'"'\\\\'"'"''"'"'/g;
-    	  s/^\\([_$as_cr_alnum]*_cv_[_$as_cr_alnum]*\\)=\\(.*\\)/\\1='"'"'\\2'"'"'/p"
+    	  s/^\\([_$ac_cr_alnum]*_cv_[_$ac_cr_alnum]*\\)=\\(.*\\)/\\1='"'"'\\2'"'"'/p"
       ;;
     *)
       sed -n \
-        "s/^\\([_$as_cr_alnum]*_cv_[_$as_cr_alnum]*\\)=\\(.*\\)/\\1=\\2/p"
+        "s/^\\([_$ac_cr_alnum]*_cv_[_$ac_cr_alnum]*\\)=\\(.*\\)/\\1=\\2/p"
       ;;
     esac;
 } >&5
@@ -776,7 +764,7 @@ trap 'exit_status=$?
     exit $exit_status
      ' 0
 for ac_signal in 1 2 13 15; do
-  trap 'ac_signal='$ac_signal'; { (exit 1); exit 1; }' $ac_signal
+  trap 'ac_status=$?; ac_signal='$ac_signal'; { (exit $ac_status); exit $ac_status; }' $ac_signal
 done
 ac_signal=0
 
@@ -796,7 +784,7 @@ if test -z "$CONFIG_SITE"; then
 fi
 for ac_site_file in $CONFIG_SITE; do
   if test -r "$ac_site_file"; then
-    { echo "$as_me:799: loading site script $ac_site_file" >&5
+    { echo "$as_me:787: loading site script $ac_site_file" >&5
 echo "$as_me: loading site script $ac_site_file" >&6;}
     cat "$ac_site_file" >&5
     . "$ac_site_file"
@@ -807,7 +795,7 @@ if test -r "$cache_file"; then
   # Some versions of bash will fail to source /dev/null (special
   # files actually), so we avoid doing that.
   if test -f "$cache_file"; then
-    { echo "$as_me:810: loading cache $cache_file" >&5
+    { echo "$as_me:798: loading cache $cache_file" >&5
 echo "$as_me: loading cache $cache_file" >&6;}
     case $cache_file in
       [\\/]* | ?:[\\/]* ) . $cache_file;;
@@ -815,14 +803,14 @@ echo "$as_me: loading cache $cache_file" >&6;}
     esac
   fi
 else
-  { echo "$as_me:818: creating cache $cache_file" >&5
+  { echo "$as_me:806: creating cache $cache_file" >&5
 echo "$as_me: creating cache $cache_file" >&6;}
   >$cache_file
 fi
 
 # Check that the precious variables saved in the cache have kept the same
 # value.
-ac_cache_corrupted=false
+ac_suggest_removing_cache=false
 for ac_var in `(set) 2>&1 |
                sed -n 's/^ac_env_\([a-zA-Z_0-9]*\)_set=.*/\1/p'`; do
   eval ac_old_set=\$ac_cv_env_${ac_var}_set
@@ -831,44 +819,31 @@ for ac_var in `(set) 2>&1 |
   eval ac_new_val="\$ac_env_${ac_var}_value"
   case $ac_old_set,$ac_new_set in
     set,)
-      { echo "$as_me:834: error: \`$ac_var' was set to \`$ac_old_val' in the previous run" >&5
-echo "$as_me: error: \`$ac_var' was set to \`$ac_old_val' in the previous run" >&2;}
-      ac_cache_corrupted=: ;;
+      { echo "$as_me:822: WARNING: \`$ac_var' was set to \`$ac_old_val' in the previous run" >&5
+echo "$as_me: WARNING: \`$ac_var' was set to \`$ac_old_val' in the previous run" >&2;}
+      ac_suggest_removing_cache=: ;;
     ,set)
-      { echo "$as_me:838: error: \`$ac_var' was not set in the previous run" >&5
-echo "$as_me: error: \`$ac_var' was not set in the previous run" >&2;}
-      ac_cache_corrupted=: ;;
+      { echo "$as_me:826: WARNING: \`$ac_var' was not set in the previous run" >&5
+echo "$as_me: WARNING: \`$ac_var' was not set in the previous run" >&2;}
+      ac_suggest_removing_cache=: ;;
     ,);;
     *)
       if test "x$ac_old_val" != "x$ac_new_val"; then
-        { echo "$as_me:844: error: \`$ac_var' has changed since the previous run:" >&5
-echo "$as_me: error: \`$ac_var' has changed since the previous run:" >&2;}
-        { echo "$as_me:846:   former value:  $ac_old_val" >&5
-echo "$as_me:   former value:  $ac_old_val" >&2;}
-        { echo "$as_me:848:   current value: $ac_new_val" >&5
-echo "$as_me:   current value: $ac_new_val" >&2;}
-        ac_cache_corrupted=:
+        { echo "$as_me:832: WARNING: \`$ac_var' has changed since the previous run:" >&5
+echo "$as_me: WARNING: \`$ac_var' has changed since the previous run:" >&2;}
+        { echo "$as_me:834: WARNING:   former value:  $ac_old_val" >&5
+echo "$as_me: WARNING:   former value:  $ac_old_val" >&2;}
+        { echo "$as_me:836: WARNING:   current value: $ac_new_val" >&5
+echo "$as_me: WARNING:   current value: $ac_new_val" >&2;}
+        ac_suggest_removing_cache=:
       fi;;
   esac
-  # Pass precious variables to config.status.  It doesn't matter if
-  # we pass some twice (in addition to the command line arguments).
-  if test "$ac_new_set" = set; then
-    case $ac_new_val in
-    *" "*|*"	"*|*[\[\]\~\#\$\^\&\*\(\)\{\}\\\|\;\<\>\?\"\']*)
-      ac_arg=$ac_var=`echo "$ac_new_val" | sed "s/'/'\\\\\\\\''/g"`
-      ac_configure_args="$ac_configure_args '$ac_arg'"
-      ;;
-    *) ac_configure_args="$ac_configure_args $ac_var=$ac_new_val"
-       ;;
-    esac
-  fi
 done
-if $ac_cache_corrupted; then
-  { echo "$as_me:867: error: changes in the environment can compromise the build" >&5
-echo "$as_me: error: changes in the environment can compromise the build" >&2;}
-  { { echo "$as_me:869: error: run \`make distclean' and/or \`rm $cache_file' and start over" >&5
-echo "$as_me: error: run \`make distclean' and/or \`rm $cache_file' and start over" >&2;}
-   { (exit 1); exit 1; }; }
+if $ac_suggest_removing_cache; then
+  { echo "$as_me:843: WARNING: changes in the environment can compromise the build" >&5
+echo "$as_me: WARNING: changes in the environment can compromise the build" >&2;}
+  { echo "$as_me:845: WARNING: consider removing $cache_file and starting over" >&5
+echo "$as_me: WARNING: consider removing $cache_file and starting over" >&2;}
 fi
 
 ac_ext=c
@@ -886,10 +861,10 @@ esac
 echo "#! $SHELL" >conftest.sh
 echo  "exit 0"   >>conftest.sh
 chmod +x conftest.sh
-if { (echo "$as_me:889: PATH=\".;.\"; conftest.sh") >&5
+if { (echo "$as_me:864: PATH=\".;.\"; conftest.sh") >&5
   (PATH=".;."; conftest.sh) 2>&5
   ac_status=$?
-  echo "$as_me:892: \$? = $ac_status" >&5
+  echo "$as_me:867: \$? = $ac_status" >&5
   (exit $ac_status); }; then
   ac_path_separator=';'
 else
@@ -915,7 +890,7 @@ for ac_dir in config $srcdir/config; do
   fi
 done
 if test -z "$ac_aux_dir"; then
-  { { echo "$as_me:918: error: cannot find install-sh or install.sh in config $srcdir/config" >&5
+  { { echo "$as_me:893: error: cannot find install-sh or install.sh in config $srcdir/config" >&5
 echo "$as_me: error: cannot find install-sh or install.sh in config $srcdir/config" >&2;}
    { (exit 1); exit 1; }; }
 fi
@@ -935,7 +910,7 @@ ac_configure="$SHELL $ac_aux_dir/configure" # This should be Cygnus configure.
 # AFS /usr/afsws/bin/install, which mishandles nonexistent args
 # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
 # ./install, which can be erroneously created by make from ./install.sh.
-echo "$as_me:938: checking for a BSD compatible install" >&5
+echo "$as_me:913: checking for a BSD compatible install" >&5
 echo $ECHO_N "checking for a BSD compatible install... $ECHO_C" >&6
 if test -z "$INSTALL"; then
 if test "${ac_cv_path_install+set}" = set; then
@@ -984,7 +959,7 @@ fi
     INSTALL=$ac_install_sh
   fi
 fi
-echo "$as_me:987: result: $INSTALL" >&5
+echo "$as_me:962: result: $INSTALL" >&5
 echo "${ECHO_T}$INSTALL" >&6
 
 # Use test -z because SunOS4 sh mishandles braces in ${var-val}.
@@ -995,7 +970,7 @@ test -z "$INSTALL_SCRIPT" && INSTALL_SCRIPT='${INSTALL}'
 
 test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
 
-echo "$as_me:998: checking whether build environment is sane" >&5
+echo "$as_me:973: checking whether build environment is sane" >&5
 echo $ECHO_N "checking whether build environment is sane... $ECHO_C" >&6
 # Just in case
 sleep 1
@@ -1018,7 +993,7 @@ if (
       # if, for instance, CONFIG_SHELL is bash and it inherits a
       # broken ls alias from the environment.  This has actually
       # happened.  Such a system could not be considered "sane".
-      { { echo "$as_me:1021: error: ls -t appears to fail.  Make sure there is not a broken
+      { { echo "$as_me:996: error: ls -t appears to fail.  Make sure there is not a broken
 alias in your environment" >&5
 echo "$as_me: error: ls -t appears to fail.  Make sure there is not a broken
 alias in your environment" >&2;}
@@ -1031,27 +1006,33 @@ then
    # Ok.
    :
 else
-   { { echo "$as_me:1034: error: newly created file is older than distributed files!
+   { { echo "$as_me:1009: error: newly created file is older than distributed files!
 Check your system clock" >&5
 echo "$as_me: error: newly created file is older than distributed files!
 Check your system clock" >&2;}
    { (exit 1); exit 1; }; }
 fi
 rm -f conftest*
-echo "$as_me:1041: result: yes" >&5
+echo "$as_me:1016: result: yes" >&5
 echo "${ECHO_T}yes" >&6
+if test "$program_transform_name" = s,x,x,; then
+  program_transform_name=
+else
+  # Double any \ or $.  echo might interpret backslashes.
+  cat <<\EOF >conftest.sed
+s,\\,\\\\,g; s,\$,$$,g
+EOF
+  program_transform_name=`echo $program_transform_name | sed -f conftest.sed`
+  rm -f conftest.sed
+fi
 test "$program_prefix" != NONE &&
-  program_transform_name="s,^,$program_prefix,;$program_transform_name"
+  program_transform_name="s,^,${program_prefix},;$program_transform_name"
 # Use a double $ so make ignores it.
 test "$program_suffix" != NONE &&
-  program_transform_name="s,\$,$program_suffix,;$program_transform_name"
-# Double any \ or $.  echo might interpret backslashes.
-# By default was `s,x,x', remove it if useless.
-cat <<\_ACEOF >conftest.sed
-s/[\\$]/&&/g;s/;s,x,x,$//
-_ACEOF
-program_transform_name=`echo $program_transform_name | sed -f conftest.sed`
-rm conftest.sed
+  program_transform_name="s,\$\$,${program_suffix},;$program_transform_name"
+
+# sed with no file args requires a program.
+test -z "$program_transform_name" && program_transform_name="s,x,x,"
 
 test x"${MISSING+set}" = xset ||
   MISSING="\${SHELL} `CDPATH=:; cd $ac_aux_dir && pwd`/missing"
@@ -1061,11 +1042,11 @@ if eval "$MISSING --run true"; then
 else
   am_missing_run=
   am_backtick='`'
-  { echo "$as_me:1064: WARNING: ${am_backtick}missing' script is too old or missing" >&5
+  { echo "$as_me:1045: WARNING: ${am_backtick}missing' script is too old or missing" >&5
 echo "$as_me: WARNING: ${am_backtick}missing' script is too old or missing" >&2;}
 fi
 
-echo "$as_me:1068: checking whether ${MAKE-make} sets \${MAKE}" >&5
+echo "$as_me:1049: checking whether ${MAKE-make} sets \${MAKE}" >&5
 echo $ECHO_N "checking whether ${MAKE-make} sets \${MAKE}... $ECHO_C" >&6
 set dummy ${MAKE-make}; ac_make=`echo "$2" | sed 'y,./+-,__p_,'`
 if eval "test \"\${ac_cv_prog_make_${ac_make}_set+set}\" = set"; then
@@ -1085,11 +1066,11 @@ fi
 rm -f conftest.make
 fi
 if eval "test \"`echo '$ac_cv_prog_make_'${ac_make}_set`\" = yes"; then
-  echo "$as_me:1088: result: yes" >&5
+  echo "$as_me:1069: result: yes" >&5
 echo "${ECHO_T}yes" >&6
   SET_MAKE=
 else
-  echo "$as_me:1092: result: no" >&5
+  echo "$as_me:1073: result: no" >&5
 echo "${ECHO_T}no" >&6
   SET_MAKE="MAKE=${MAKE-make}"
 fi
@@ -1099,7 +1080,7 @@ PACKAGE=autoconf
 VERSION=2.50c
 
 if test "`cd $srcdir && pwd`" != "`pwd`" && test -f $srcdir/config.status; then
-  { { echo "$as_me:1102: error: source directory already configured; run \"make distclean\" there first" >&5
+  { { echo "$as_me:1083: error: source directory already configured; run \"make distclean\" there first" >&5
 echo "$as_me: error: source directory already configured; run \"make distclean\" there first" >&2;}
    { (exit 1); exit 1; }; }
 fi
@@ -1129,7 +1110,7 @@ AUTOTEST_PATH=..
 
 # Extract the first word of "expr", so it can be a program name with args.
 set dummy expr; ac_word=$2
-echo "$as_me:1132: checking for $ac_word" >&5
+echo "$as_me:1113: checking for $ac_word" >&5
 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
 if test "${ac_cv_path_EXPR+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -1146,7 +1127,7 @@ for ac_dir in $ac_dummy; do
   test -z "$ac_dir" && ac_dir=.
   if $as_executable_p "$ac_dir/$ac_word"; then
    ac_cv_path_EXPR="$ac_dir/$ac_word"
-   echo "$as_me:1149: found $ac_dir/$ac_word" >&5
+   echo "$as_me:1130: found $ac_dir/$ac_word" >&5
    break
 fi
 done
@@ -1157,10 +1138,10 @@ fi
 EXPR=$ac_cv_path_EXPR
 
 if test -n "$EXPR"; then
-  echo "$as_me:1160: result: $EXPR" >&5
+  echo "$as_me:1141: result: $EXPR" >&5
 echo "${ECHO_T}$EXPR" >&6
 else
-  echo "$as_me:1163: result: no" >&5
+  echo "$as_me:1144: result: no" >&5
 echo "${ECHO_T}no" >&6
 fi
 
@@ -1172,7 +1153,7 @@ for ac_prog in gm4 gnum4 m4
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
-echo "$as_me:1175: checking for $ac_word" >&5
+echo "$as_me:1156: checking for $ac_word" >&5
 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
 if test "${ac_cv_path_M4+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -1189,7 +1170,7 @@ for ac_dir in $ac_dummy; do
   test -z "$ac_dir" && ac_dir=.
   if $as_executable_p "$ac_dir/$ac_word"; then
    ac_cv_path_M4="$ac_dir/$ac_word"
-   echo "$as_me:1192: found $ac_dir/$ac_word" >&5
+   echo "$as_me:1173: found $ac_dir/$ac_word" >&5
    break
 fi
 done
@@ -1200,10 +1181,10 @@ fi
 M4=$ac_cv_path_M4
 
 if test -n "$M4"; then
-  echo "$as_me:1203: result: $M4" >&5
+  echo "$as_me:1184: result: $M4" >&5
 echo "${ECHO_T}$M4" >&6
 else
-  echo "$as_me:1206: result: no" >&5
+  echo "$as_me:1187: result: no" >&5
 echo "${ECHO_T}no" >&6
 fi
 
@@ -1211,7 +1192,7 @@ fi
 done
 test -n "$M4" || M4="m4"
 
-echo "$as_me:1214: checking whether m4 supports frozen files" >&5
+echo "$as_me:1195: checking whether m4 supports frozen files" >&5
 echo $ECHO_N "checking whether m4 supports frozen files... $ECHO_C" >&6
 if test "${ac_cv_prog_gnu_m4+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -1223,22 +1204,22 @@ if test x"$M4" != x; then
   esac
 fi
 fi
-echo "$as_me:1226: result: $ac_cv_prog_gnu_m4" >&5
+echo "$as_me:1207: result: $ac_cv_prog_gnu_m4" >&5
 echo "${ECHO_T}$ac_cv_prog_gnu_m4" >&6
 if test x"$ac_cv_prog_gnu_m4" != xyes; then
-  { { echo "$as_me:1229: error: GNU m4 1.4 is required" >&5
+  { { echo "$as_me:1210: error: GNU m4 1.4 is required" >&5
 echo "$as_me: error: GNU m4 1.4 is required" >&2;}
    { (exit 1); exit 1; }; }
 fi
 # This is needed because Automake does not seem to realize there is
 # a AC-SUBST inside AC-PROG-GNU-M4.  Grmph!
 
-# `autoconf' and `ifnames' use AWK.
+# `autoconf' and `ifnames' use AWK.  And we need decent RE support.
 for ac_prog in mawk gawk nawk awk
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
-echo "$as_me:1241: checking for $ac_word" >&5
+echo "$as_me:1222: checking for $ac_word" >&5
 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
 if test "${ac_cv_prog_AWK+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -1253,7 +1234,7 @@ for ac_dir in $ac_dummy; do
   test -z "$ac_dir" && ac_dir=.
   $as_executable_p "$ac_dir/$ac_word" || continue
 ac_cv_prog_AWK="$ac_prog"
-echo "$as_me:1256: found $ac_dir/$ac_word" >&5
+echo "$as_me:1237: found $ac_dir/$ac_word" >&5
 break
 done
 
@@ -1261,16 +1242,25 @@ fi
 fi
 AWK=$ac_cv_prog_AWK
 if test -n "$AWK"; then
-  echo "$as_me:1264: result: $AWK" >&5
+  echo "$as_me:1245: result: $AWK" >&5
 echo "${ECHO_T}$AWK" >&6
 else
-  echo "$as_me:1267: result: no" >&5
+  echo "$as_me:1248: result: no" >&5
 echo "${ECHO_T}no" >&6
 fi
 
   test -n "$AWK" && break
 done
 
+# Some AWK fail
+if echo xfoo | $AWK '/foo|^bar$/ { print }' | grep xfoo >/dev/null; then :; else
+  { { echo "$as_me:1257: error: the regex engine of $AWK is too broken to be used
+                you might want to install GNU AWK" >&5
+echo "$as_me: error: the regex engine of $AWK is too broken to be used
+                you might want to install GNU AWK" >&2;}
+   { (exit 1); exit 1; }; }
+fi
+
 # Generating man pages.
 
 HELP2MAN=${HELP2MAN-"${am_missing_run}help2man"}
@@ -1278,7 +1268,7 @@ HELP2MAN=${HELP2MAN-"${am_missing_run}help2man"}
 # We use a path for perl so the #! line in autoscan will work.
 # Extract the first word of "perl", so it can be a program name with args.
 set dummy perl; ac_word=$2
-echo "$as_me:1281: checking for $ac_word" >&5
+echo "$as_me:1271: checking for $ac_word" >&5
 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
 if test "${ac_cv_path_PERL+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -1295,7 +1285,7 @@ for ac_dir in $ac_dummy; do
   test -z "$ac_dir" && ac_dir=.
   if $as_executable_p "$ac_dir/$ac_word"; then
    ac_cv_path_PERL="$ac_dir/$ac_word"
-   echo "$as_me:1298: found $ac_dir/$ac_word" >&5
+   echo "$as_me:1288: found $ac_dir/$ac_word" >&5
    break
 fi
 done
@@ -1307,17 +1297,17 @@ fi
 PERL=$ac_cv_path_PERL
 
 if test -n "$PERL"; then
-  echo "$as_me:1310: result: $PERL" >&5
+  echo "$as_me:1300: result: $PERL" >&5
 echo "${ECHO_T}$PERL" >&6
 else
-  echo "$as_me:1313: result: no" >&5
+  echo "$as_me:1303: result: no" >&5
 echo "${ECHO_T}no" >&6
 fi
 
 if test "$PERL" != no; then
   PERLSCRIPTS="autoscan autoupdate"
 else
-  { echo "$as_me:1320: WARNING: autoscan and autoupdate will not be built since perl is not found" >&5
+  { echo "$as_me:1310: WARNING: autoscan and autoupdate will not be built since perl is not found" >&5
 echo "$as_me: WARNING: autoscan and autoupdate will not be built since perl is not found" >&2;}
 fi
 
@@ -1333,7 +1323,7 @@ fi
 # AFS /usr/afsws/bin/install, which mishandles nonexistent args
 # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
 # ./install, which can be erroneously created by make from ./install.sh.
-echo "$as_me:1336: checking for a BSD compatible install" >&5
+echo "$as_me:1326: checking for a BSD compatible install" >&5
 echo $ECHO_N "checking for a BSD compatible install... $ECHO_C" >&6
 if test -z "$INSTALL"; then
 if test "${ac_cv_path_install+set}" = set; then
@@ -1382,7 +1372,7 @@ fi
     INSTALL=$ac_install_sh
   fi
 fi
-echo "$as_me:1385: result: $INSTALL" >&5
+echo "$as_me:1375: result: $INSTALL" >&5
 echo "${ECHO_T}$INSTALL" >&6
 
 # Use test -z because SunOS4 sh mishandles braces in ${var-val}.
@@ -1426,12 +1416,12 @@ _ACEOF
       # substitution turns \\\\ into \\, and sed turns \\ into \).
       sed -n \
         "s/'/'\\\\''/g;
-    	  s/^\\([_$as_cr_alnum]*_cv_[_$as_cr_alnum]*\\)=\\(.*\\)/\\1='\\2'/p"
+    	  s/^\\([_$ac_cr_alnum]*_cv_[_$ac_cr_alnum]*\\)=\\(.*\\)/\\1='\\2'/p"
       ;;
     *)
       # `set' quotes correctly as required by POSIX, so do not add quotes.
       sed -n \
-        "s/^\\([_$as_cr_alnum]*_cv_[_$as_cr_alnum]*\\)=\\(.*\\)/\\1=\\2/p"
+        "s/^\\([_$ac_cr_alnum]*_cv_[_$ac_cr_alnum]*\\)=\\(.*\\)/\\1=\\2/p"
       ;;
     esac;
 } |
@@ -1506,7 +1496,7 @@ rm -f confdef2opt.sed
 : ${CONFIG_STATUS=./config.status}
 ac_clean_files_save=$ac_clean_files
 ac_clean_files="$ac_clean_files $CONFIG_STATUS"
-{ echo "$as_me:1509: creating $CONFIG_STATUS" >&5
+{ echo "$as_me:1499: creating $CONFIG_STATUS" >&5
 echo "$as_me: creating $CONFIG_STATUS" >&6;}
 cat >$CONFIG_STATUS <<_ACEOF
 #! $SHELL
@@ -1630,7 +1620,7 @@ EOF
 cat >>$CONFIG_STATUS <<EOF
 ac_cs_version="\\
 GNU Autoconf config.status 2.50c
-configured by $0, generated by GNU Autoconf 2.50c,
+configured by $0, generated by GNU Autoconf 2.50,
   with options \\"`echo "$ac_configure_args" | sed 's/[\\""\`\$]/\\\\&/g'`\\"
 
 Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001
@@ -1674,7 +1664,7 @@ cat >>$CONFIG_STATUS <<\EOF
     echo "$ac_cs_version"; exit 0 ;;
   --he | --h)
     # Conflict between --help and --header
-    { { echo "$as_me:1677: error: ambiguous option: $1
+    { { echo "$as_me:1667: error: ambiguous option: $1
 Try \`$0 --help' for more information." >&5
 echo "$as_me: error: ambiguous option: $1
 Try \`$0 --help' for more information." >&2;}
@@ -1692,15 +1682,24 @@ Try \`$0 --help' for more information." >&2;}
     CONFIG_HEADERS="$CONFIG_HEADERS $1"
     ac_need_defaults=false;;
 
+  # Handling of arguments.
+  'Makefile' ) CONFIG_FILES="$CONFIG_FILES Makefile" ;;
+  'm4/Makefile' ) CONFIG_FILES="$CONFIG_FILES m4/Makefile" ;;
+  'man/Makefile' ) CONFIG_FILES="$CONFIG_FILES man/Makefile" ;;
+  'doc/Makefile' ) CONFIG_FILES="$CONFIG_FILES doc/Makefile" ;;
+  'config/Makefile' ) CONFIG_FILES="$CONFIG_FILES config/Makefile" ;;
+  'tests/Makefile' ) CONFIG_FILES="$CONFIG_FILES tests/Makefile" ;;
+  'tests/atconfig' ) CONFIG_FILES="$CONFIG_FILES tests/atconfig" ;;
+
   # This is an error.
-  -*) { { echo "$as_me:1696: error: unrecognized option: $1
+  -*) { { echo "$as_me:1695: error: unrecognized option: $1
 Try \`$0 --help' for more information." >&5
 echo "$as_me: error: unrecognized option: $1
 Try \`$0 --help' for more information." >&2;}
    { (exit 1); exit 1; }; } ;;
-
-  *) ac_config_targets="$ac_config_targets $1" ;;
-
+  *) { { echo "$as_me:1700: error: invalid argument: $1" >&5
+echo "$as_me: error: invalid argument: $1" >&2;}
+   { (exit 1); exit 1; }; };;
   esac
   shift
 done
@@ -1712,7 +1711,7 @@ cat >&5 << _ACEOF
 ## Running config.status.  ##
 ## ----------------------- ##
 
-This file was extended by $as_me (GNU Autoconf 2.50c) 2.50c, executed with
+This file was extended by $as_me (GNU Autoconf 2.50c) 2.50, executed with
   > $ac_cs_invocation
 on `(hostname || uname -n) 2>/dev/null | sed 1q`
 
@@ -1720,23 +1719,6 @@ _ACEOF
 EOF
 
 cat >>$CONFIG_STATUS <<\EOF
-for ac_config_target in $ac_config_targets
-do
-  case "$ac_config_target" in
-  # Handling of arguments.
-  "Makefile" ) CONFIG_FILES="$CONFIG_FILES Makefile" ;;
-  "m4/Makefile" ) CONFIG_FILES="$CONFIG_FILES m4/Makefile" ;;
-  "man/Makefile" ) CONFIG_FILES="$CONFIG_FILES man/Makefile" ;;
-  "doc/Makefile" ) CONFIG_FILES="$CONFIG_FILES doc/Makefile" ;;
-  "config/Makefile" ) CONFIG_FILES="$CONFIG_FILES config/Makefile" ;;
-  "tests/Makefile" ) CONFIG_FILES="$CONFIG_FILES tests/Makefile" ;;
-  "tests/atconfig" ) CONFIG_FILES="$CONFIG_FILES tests/atconfig" ;;
-  *) { { echo "$as_me:1734: error: invalid argument: $ac_config_target" >&5
-echo "$as_me: error: invalid argument: $ac_config_target" >&2;}
-   { (exit 1); exit 1; }; };;
-  esac
-done
-
 # If the user did not use the arguments to specify the items to instantiate,
 # then the envvar interface is used.  Set only those that are not.
 # We use the long form for the default assignment because of an extremely
@@ -1749,7 +1731,7 @@ fi
 $debug ||
 {
   trap 'exit_status=$?; rm -rf $tmp && exit $exit_status' 0
-  trap '{ (exit 1); exit 1; }' 1 2 13 15
+  trap '{ (exit $?); exit $?; }' 1 2 13 15
 }
 
 # Create a (secure) tmp directory for tmp files.
@@ -1802,9 +1784,6 @@ s,@PACKAGE_TARNAME@,$PACKAGE_TARNAME,;t t
 s,@PACKAGE_VERSION@,$PACKAGE_VERSION,;t t
 s,@PACKAGE_STRING@,$PACKAGE_STRING,;t t
 s,@PACKAGE_BUGREPORT@,$PACKAGE_BUGREPORT,;t t
-s,@build_alias@,$build_alias,;t t
-s,@host_alias@,$host_alias,;t t
-s,@target_alias@,$target_alias,;t t
 s,@ECHO_C@,$ECHO_C,;t t
 s,@ECHO_N@,$ECHO_N,;t t
 s,@ECHO_T@,$ECHO_T,;t t
@@ -1943,7 +1922,7 @@ done; }
   esac
 
   if test x"$ac_file" != x-; then
-    { echo "$as_me:1946: creating $ac_file" >&5
+    { echo "$as_me:1925: creating $ac_file" >&5
 echo "$as_me: creating $ac_file" >&6;}
     rm -f "$ac_file"
   fi
@@ -1961,7 +1940,7 @@ echo "$as_me: creating $ac_file" >&6;}
       -) echo $tmp/stdin ;;
       [\\/$]*)
          # Absolute (can't be DOS-style, as IFS=:)
-         test -f "$f" || { { echo "$as_me:1964: error: cannot find input file: $f" >&5
+         test -f "$f" || { { echo "$as_me:1943: error: cannot find input file: $f" >&5
 echo "$as_me: error: cannot find input file: $f" >&2;}
    { (exit 1); exit 1; }; }
          echo $f;;
@@ -1974,7 +1953,7 @@ echo "$as_me: error: cannot find input file: $f" >&2;}
            echo $srcdir/$f
          else
            # /dev/null tree
-           { { echo "$as_me:1977: error: cannot find input file: $f" >&5
+           { { echo "$as_me:1956: error: cannot find input file: $f" >&5
 echo "$as_me: error: cannot find input file: $f" >&2;}
    { (exit 1); exit 1; }; }
          fi;;
diff --git a/configure.in b/configure.in
index c725e580..6f38a93e 100644
--- a/configure.in
+++ b/configure.in
@@ -21,8 +21,13 @@ fi
 # a AC-SUBST inside AC-PROG-GNU-M4.  Grmph!
 AC_SUBST(M4)
 
-# `autoconf' and `ifnames' use AWK.
+# `autoconf' and `ifnames' use AWK.  And we need decent RE support.
 AC_PROG_AWK
+# Some AWK fail
+if echo xfoo | $AWK '/foo|^bar$/ { print }' | grep xfoo >/dev/null; then :; else
+  AC_MSG_ERROR([the regex engine of $AWK is too broken to be used
+                you might want to install GNU AWK])
+fi
 
 # Generating man pages.
 AM_MISSING_PROG(HELP2MAN, help2man)
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 0a976d28..da5fa65d 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -4676,6 +4676,7 @@ check for characteristics not listed here, use @code{AC_TRY_COMPILE}
 making sure to first set the current language to Fortran 77
 @code{AC_LANG(Fortran 77)} (@pxref{Language Choice}).
 
+
 @defmac AC_F77_LIBRARY_LDFLAGS
 @maindex F77_LIBRARY_LDFLAGS
 @ovindex FLIBS
@@ -4705,7 +4706,8 @@ The macro @code{AC_F77_DUMMY_MAIN} or @code{AC_F77_MAIN} will probably
 also be necessary to link C/C++ with Fortran; see below.
 @end defmac
 
-@defmac AC_F77_DUMMY_MAIN(@ovar{ACTION-IF-FAIL}, @ovar{ACTION-IF-NONE}, @ovar{ACTION-IF-FOUND})
+
+@defmac AC_F77_DUMMY_MAIN (@ovar{action-if-fail}, @ovar{action-if-none}, @ovar{action-if-found})
 @maindex F77_DUMMY_MAIN
 @cvindex F77_DUMMY_MAIN
 With many compilers, the Fortran libraries detected by
@@ -4722,10 +4724,10 @@ provide a dummy @code{MAIN__} routine in order to prevent linking errors
 on some systems.  @code{AC_F77_DUMMY_MAIN} detects whether any such
 routine is @emph{required} for linking, and what its name is.
 
-If it cannot figure out how to link successfully, @code{ACTION-IF-FAIL}
+If it cannot figure out how to link successfully, @code{action-if-fail}
 is executed, with the default action being to exit with an error
-message.  @code{ACTION-IF-NONE} is executed if no dummy main is needed
-(default: no action).  @code{ACTION-IF-FOUND} is executed if a dummy
+message.  @code{action-if-none} is executed if no dummy main is needed
+(default: no action).  @code{action-if-found} is executed if a dummy
 main is required; the default action is to define @code{F77_DUMMY_MAIN}
 to the name of this required routine (e.g. @code{MAIN__}).
 
@@ -8302,6 +8304,23 @@ bar
 foo
 @end example
 
+Some AWK, such as HPUX 11.0's native one, have regex engines fragile to
+inner anchors:
+
+@example
+$ echo xfoo | $AWK '/foo|^bar/ @{ print @}'
+$ echo bar | $AWK '/foo|^bar/ @{ print @}'
+bar
+$ echo xfoo | $AWK '/^bar|foo/ @{ print @}'
+xfoo
+$ echo bar | $AWK '/^bar|foo/ @{ print @}'
+bar
+@end example
+
+@noindent
+Either do not depend on such patterns (i.e., use @samp{/^(.*foo|bar)/},
+or use a simple test to reject such AWK.
+
 
 @item @command{cat}
 @c ----------------
diff --git a/man/autoconf.1 b/man/autoconf.1
index 96264e02..07e41ffe 100644
--- a/man/autoconf.1
+++ b/man/autoconf.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.24.
-.TH AUTOCONF "1" "June 2001" "GNU Autoconf 2.50c" FSF
+.TH AUTOCONF "1" "July 2001" "GNU Autoconf 2.50c" FSF
 .SH NAME
 autoconf \- Generate configuration scripts
 .SH SYNOPSIS
diff --git a/man/autoheader.1 b/man/autoheader.1
index 897b9f61..acfcaaa2 100644
--- a/man/autoheader.1
+++ b/man/autoheader.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.24.
-.TH AUTOHEADER "1" "June 2001" "GNU Autoconf 2.50c" FSF
+.TH AUTOHEADER "1" "July 2001" "GNU Autoconf 2.50c" FSF
 .SH NAME
 autoheader \- Create a template header for configure
 .SH SYNOPSIS
diff --git a/man/autoreconf.1 b/man/autoreconf.1
index 2e370fd3..72264216 100644
--- a/man/autoreconf.1
+++ b/man/autoreconf.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.24.
-.TH AUTORECONF "1" "June 2001" "GNU Autoconf 2.50c" FSF
+.TH AUTORECONF "1" "July 2001" "GNU Autoconf 2.50c" FSF
 .SH NAME
 autoreconf \- Update generated configuration files
 .SH SYNOPSIS
diff --git a/man/autoupdate.1 b/man/autoupdate.1
index ab3b0d0d..7a185055 100644
--- a/man/autoupdate.1
+++ b/man/autoupdate.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.24.
-.TH AUTOUPDATE "1" "June 2001" "GNU Autoconf 2.50c" FSF
+.TH AUTOUPDATE "1" "July 2001" "GNU Autoconf 2.50c" FSF
 .SH NAME
 autoupdate \- Update a configure.in to a newer Autoconf
 .SH SYNOPSIS
diff --git a/man/ifnames.1 b/man/ifnames.1
index cb55c1ea..204ab49c 100644
--- a/man/ifnames.1
+++ b/man/ifnames.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.24.
-.TH IFNAMES "1" "June 2001" "GNU Autoconf 2.50c" FSF
+.TH IFNAMES "1" "July 2001" "GNU Autoconf 2.50c" FSF
 .SH NAME
 ifnames \- Extract CPP conditionals from a set of files
 .SH SYNOPSIS