From 177be3f9bbb0c82e77d24c3982f57444b69200c6 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Thu, 19 Jul 2007 17:15:30 +0000
Subject: [PATCH] Adjust configure script to print the bison and flex versions
 in use. Minor rearrangements to make a few tests in a more logical order.

---
 config/programs.m4 |  46 +++++-
 configure          | 365 +++++++++++++++++++++++----------------------
 configure.in       |  34 +----
 3 files changed, 236 insertions(+), 209 deletions(-)

diff --git a/config/programs.m4 b/config/programs.m4
index fb9793fac1a..9434113fb0f 100644
--- a/config/programs.m4
+++ b/config/programs.m4
@@ -1,4 +1,44 @@
-# $PostgreSQL: pgsql/config/programs.m4,v 1.20 2006/05/23 19:28:45 momjian Exp $
+# $PostgreSQL: pgsql/config/programs.m4,v 1.21 2007/07/19 17:15:30 tgl Exp $
+
+
+# PGAC_PATH_YACC
+# --------------
+# Look for Bison, set the output variable YACC to its path if found.
+# Reject versions before 1.875 (they have bugs or capacity limits).
+# Note we do not accept other implementations of yacc.
+
+AC_DEFUN([PGAC_PATH_YACC],
+[# Let the user override the search
+if test -z "$YACC"; then
+  AC_CHECK_PROGS(YACC, ['bison -y'])
+fi
+
+if test "$YACC"; then
+  pgac_yacc_version=`$YACC --version 2>/dev/null | sed q`
+  AC_MSG_NOTICE([using $pgac_yacc_version])
+  if echo "$pgac_yacc_version" | $AWK '{ if ([$]4 < 1.875) exit 0; else exit 1;}'
+  then
+    AC_MSG_WARN([
+*** The installed version of Bison is too old to use with PostgreSQL.
+*** Bison version 1.875 or later is required.])
+    YACC=""
+  fi
+fi
+
+if test -z "$YACC"; then
+  AC_MSG_WARN([
+*** Without Bison you will not be able to build PostgreSQL from CVS nor
+*** change any of the parser definition files.  You can obtain Bison from
+*** a GNU mirror site.  (If you are using the official distribution of
+*** PostgreSQL then you do not need to worry about this, because the Bison
+*** output is pre-generated.)  To use a different yacc program (possible,
+*** but not recommended), set the environment variable YACC before running
+*** 'configure'.])
+fi
+# We don't need AC_SUBST(YACC) because AC_PATH_PROG did it
+AC_SUBST(YFLAGS)
+])# PGAC_PATH_YACC
+
 
 
 # PGAC_PATH_FLEX
@@ -56,12 +96,12 @@ if test x"$pgac_cv_path_flex" = x"no"; then
 *** a GNU mirror site.  (If you are using the official distribution of
 *** PostgreSQL then you do not need to worry about this because the Flex
 *** output is pre-generated.)])
-fi
 
-if test x"$pgac_cv_path_flex" = x"no"; then
   FLEX=
 else
   FLEX=$pgac_cv_path_flex
+  pgac_flex_version=`$FLEX -V 2>/dev/null`
+  AC_MSG_NOTICE([using $pgac_flex_version])
 fi
 
 AC_SUBST(FLEX)
diff --git a/configure b/configure
index d5568fca3cb..0ee9dac06ba 100755
--- a/configure
+++ b/configure
@@ -314,7 +314,7 @@ ac_includes_default="\
 # include <unistd.h>
 #endif"
 
-ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS configure_args build build_cpu build_vendor build_os host host_cpu host_vendor host_os PORTNAME docdir enable_nls WANTED_LANGUAGES default_port enable_shared enable_rpath enable_debug enable_profiling DTRACE DTRACEFLAGS enable_dtrace CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT CPP GCC TAS autodepend INCLUDES enable_thread_safety with_tcl with_perl with_python with_gssapi with_krb5 krb_srvtab with_pam with_ldap with_bonjour with_openssl with_ossp_uuid XML2_CONFIG with_libxml with_libxslt with_zlib EGREP ELF_SYS LDFLAGS_SL AWK FLEX FLEXFLAGS LN_S LD with_gnu_ld ld_R_works RANLIB ac_ct_RANLIB TAR STRIP ac_ct_STRIP STRIP_STATIC_LIB STRIP_SHARED_LIB YACC YFLAGS PERL perl_archlibexp perl_privlibexp perl_useshrplib perl_embed_ldflags PYTHON python_version python_configdir python_includespec python_libdir python_libspec python_additional_libs HAVE_IPV6 LIBOBJS acx_pthread_config PTHREAD_CC PTHREAD_LIBS PTHREAD_CFLAGS LDAP_LIBS_FE LDAP_LIBS_BE HAVE_POSIX_SIGNALS MSGFMT MSGMERGE XGETTEXT localedir TCLSH TCL_CONFIG_SH TCL_INCLUDE_SPEC TCL_LIB_FILE TCL_LIBS TCL_LIB_SPEC TCL_SHARED_BUILD TCL_SHLIB_LD_LIBS NSGMLS JADE have_docbook DOCBOOKSTYLE COLLATEINDEX SGMLSPL vpath_build LTLIBOBJS'
+ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS configure_args build build_cpu build_vendor build_os host host_cpu host_vendor host_os PORTNAME docdir enable_nls WANTED_LANGUAGES default_port enable_shared enable_rpath enable_debug enable_profiling DTRACE DTRACEFLAGS enable_dtrace CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT CPP GCC TAS autodepend INCLUDES enable_thread_safety with_tcl with_perl with_python with_gssapi with_krb5 krb_srvtab with_pam with_ldap with_bonjour with_openssl with_ossp_uuid XML2_CONFIG with_libxml with_libxslt with_zlib EGREP ELF_SYS LDFLAGS_SL LD with_gnu_ld ld_R_works RANLIB ac_ct_RANLIB STRIP ac_ct_STRIP STRIP_STATIC_LIB STRIP_SHARED_LIB TAR LN_S AWK YACC YFLAGS FLEX FLEXFLAGS PERL perl_archlibexp perl_privlibexp perl_useshrplib perl_embed_ldflags PYTHON python_version python_configdir python_includespec python_libdir python_libspec python_additional_libs HAVE_IPV6 LIBOBJS acx_pthread_config PTHREAD_CC PTHREAD_LIBS PTHREAD_CFLAGS LDAP_LIBS_FE LDAP_LIBS_BE HAVE_POSIX_SIGNALS MSGFMT MSGMERGE XGETTEXT localedir TCLSH TCL_CONFIG_SH TCL_INCLUDE_SPEC TCL_LIB_FILE TCL_LIBS TCL_LIB_SPEC TCL_SHARED_BUILD TCL_SHLIB_LD_LIBS NSGMLS JADE have_docbook DOCBOOKSTYLE COLLATEINDEX SGMLSPL vpath_build LTLIBOBJS'
 ac_subst_files=''
 
 # Initialize some variables set by options.
@@ -4547,131 +4547,6 @@ echo "$as_me: using LDFLAGS=$LDFLAGS" >&6;}
 
 
 
-for ac_prog in gawk mawk 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:$LINENO: 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) $ECHO_C" >&6
-else
-  if test -n "$AWK"; then
-  ac_cv_prog_AWK="$AWK" # Let the user override the test.
-else
-as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
-for as_dir in $PATH
-do
-  IFS=$as_save_IFS
-  test -z "$as_dir" && as_dir=.
-  for ac_exec_ext in '' $ac_executable_extensions; do
-  if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_AWK="$ac_prog"
-    echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
-    break 2
-  fi
-done
-done
-
-fi
-fi
-AWK=$ac_cv_prog_AWK
-if test -n "$AWK"; then
-  echo "$as_me:$LINENO: result: $AWK" >&5
-echo "${ECHO_T}$AWK" >&6
-else
-  echo "$as_me:$LINENO: result: no" >&5
-echo "${ECHO_T}no" >&6
-fi
-
-  test -n "$AWK" && break
-done
-
-echo "$as_me:$LINENO: checking for flex" >&5
-echo $ECHO_N "checking for flex... $ECHO_C" >&6
-if test "${pgac_cv_path_flex+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-  # Let the user override the test
-if test -n "$FLEX"; then
-  pgac_cv_path_flex=$FLEX
-else
-  pgac_save_IFS=$IFS
-  IFS=$PATH_SEPARATOR
-  for pgac_dir in $PATH; do
-    IFS=$pgac_save_IFS
-    if test -z "$pgac_dir" || test x"$pgac_dir" = x"."; then
-      pgac_dir=`pwd`
-    fi
-    for pgac_prog in flex lex; do
-      pgac_candidate="$pgac_dir/$pgac_prog"
-      if test -f "$pgac_candidate" \
-        && $pgac_candidate --version </dev/null >/dev/null 2>&1
-      then
-        echo '%%'  > conftest.l
-        if $pgac_candidate -t conftest.l 2>/dev/null | grep FLEX_SCANNER >/dev/null 2>&1; then
-          if $pgac_candidate --version | grep ' 2\.5\.3$' >/dev/null 2>&1; then
-            pgac_broken_flex=$pgac_candidate
-            continue
-          fi
-
-          pgac_cv_path_flex=$pgac_candidate
-          break 2
-        fi
-      fi
-    done
-  done
-  rm -f conftest.l lex.yy.c
-  : ${pgac_cv_path_flex=no}
-fi
-
-fi
-echo "$as_me:$LINENO: result: $pgac_cv_path_flex" >&5
-echo "${ECHO_T}$pgac_cv_path_flex" >&6
-if test x"$pgac_cv_path_flex" = x"no"; then
-  if test -n "$pgac_broken_flex"; then
-    { echo "$as_me:$LINENO: WARNING:
-*** The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
-*** should get version 2.5.4 or later." >&5
-echo "$as_me: WARNING:
-*** The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
-*** should get version 2.5.4 or later." >&2;}
-  fi
-
-  { echo "$as_me:$LINENO: WARNING:
-*** Without Flex you will not be able to build PostgreSQL from CVS or
-*** change any of the scanner definition files.  You can obtain Flex from
-*** a GNU mirror site.  (If you are using the official distribution of
-*** PostgreSQL then you do not need to worry about this because the Flex
-*** output is pre-generated.)" >&5
-echo "$as_me: WARNING:
-*** Without Flex you will not be able to build PostgreSQL from CVS or
-*** change any of the scanner definition files.  You can obtain Flex from
-*** a GNU mirror site.  (If you are using the official distribution of
-*** PostgreSQL then you do not need to worry about this because the Flex
-*** output is pre-generated.)" >&2;}
-fi
-
-if test x"$pgac_cv_path_flex" = x"no"; then
-  FLEX=
-else
-  FLEX=$pgac_cv_path_flex
-fi
-
-
-
-
-echo "$as_me:$LINENO: checking whether ln -s works" >&5
-echo $ECHO_N "checking whether ln -s works... $ECHO_C" >&6
-LN_S=$as_ln_s
-if test "$LN_S" = "ln -s"; then
-  echo "$as_me:$LINENO: result: yes" >&5
-echo "${ECHO_T}yes" >&6
-else
-  echo "$as_me:$LINENO: result: no, using $LN_S" >&5
-echo "${ECHO_T}no, using $LN_S" >&6
-fi
-
 
 # Check whether --with-gnu-ld or --without-gnu-ld was given.
 if test "${with_gnu_ld+set}" = set; then
@@ -4916,45 +4791,6 @@ else
   RANLIB="$ac_cv_prog_RANLIB"
 fi
 
-# Extract the first word of "tar", so it can be a program name with args.
-set dummy tar; ac_word=$2
-echo "$as_me:$LINENO: checking for $ac_word" >&5
-echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
-if test "${ac_cv_path_TAR+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-  case $TAR in
-  [\\/]* | ?:[\\/]*)
-  ac_cv_path_TAR="$TAR" # Let the user override the test with a path.
-  ;;
-  *)
-  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
-for as_dir in $PATH
-do
-  IFS=$as_save_IFS
-  test -z "$as_dir" && as_dir=.
-  for ac_exec_ext in '' $ac_executable_extensions; do
-  if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_path_TAR="$as_dir/$ac_word$ac_exec_ext"
-    echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
-    break 2
-  fi
-done
-done
-
-  ;;
-esac
-fi
-TAR=$ac_cv_path_TAR
-
-if test -n "$TAR"; then
-  echo "$as_me:$LINENO: result: $TAR" >&5
-echo "${ECHO_T}$TAR" >&6
-else
-  echo "$as_me:$LINENO: result: no" >&5
-echo "${ECHO_T}no" >&6
-fi
-
 
   if test -n "$ac_tool_prefix"; then
   # Extract the first word of "${ac_tool_prefix}strip", so it can be a program name with args.
@@ -5054,6 +4890,98 @@ echo "${ECHO_T}no" >&6
 
 
 
+# Extract the first word of "tar", so it can be a program name with args.
+set dummy tar; ac_word=$2
+echo "$as_me:$LINENO: checking for $ac_word" >&5
+echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
+if test "${ac_cv_path_TAR+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  case $TAR in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_TAR="$TAR" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+  for ac_exec_ext in '' $ac_executable_extensions; do
+  if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_TAR="$as_dir/$ac_word$ac_exec_ext"
+    echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+done
+
+  ;;
+esac
+fi
+TAR=$ac_cv_path_TAR
+
+if test -n "$TAR"; then
+  echo "$as_me:$LINENO: result: $TAR" >&5
+echo "${ECHO_T}$TAR" >&6
+else
+  echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6
+fi
+
+echo "$as_me:$LINENO: checking whether ln -s works" >&5
+echo $ECHO_N "checking whether ln -s works... $ECHO_C" >&6
+LN_S=$as_ln_s
+if test "$LN_S" = "ln -s"; then
+  echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6
+else
+  echo "$as_me:$LINENO: result: no, using $LN_S" >&5
+echo "${ECHO_T}no, using $LN_S" >&6
+fi
+
+for ac_prog in gawk mawk nawk awk
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+echo "$as_me:$LINENO: 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) $ECHO_C" >&6
+else
+  if test -n "$AWK"; then
+  ac_cv_prog_AWK="$AWK" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+  for ac_exec_ext in '' $ac_executable_extensions; do
+  if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_AWK="$ac_prog"
+    echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+done
+
+fi
+fi
+AWK=$ac_cv_prog_AWK
+if test -n "$AWK"; then
+  echo "$as_me:$LINENO: result: $AWK" >&5
+echo "${ECHO_T}$AWK" >&6
+else
+  echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6
+fi
+
+  test -n "$AWK" && break
+done
+
+
+# Let the user override the search
 if test -z "$YACC"; then
   for ac_prog in 'bison -y'
 do
@@ -5095,21 +5023,26 @@ fi
   test -n "$YACC" && break
 done
 
+fi
 
-  if test "$YACC"; then
-    if $YACC --version | sed q | $AWK '{ if ($4 < 1.875) exit 0; else exit 1;}'; then
-      { echo "$as_me:$LINENO: WARNING:
+if test "$YACC"; then
+  pgac_yacc_version=`$YACC --version 2>/dev/null | sed q`
+  { echo "$as_me:$LINENO: using $pgac_yacc_version" >&5
+echo "$as_me: using $pgac_yacc_version" >&6;}
+  if echo "$pgac_yacc_version" | $AWK '{ if ($4 < 1.875) exit 0; else exit 1;}'
+  then
+    { echo "$as_me:$LINENO: WARNING:
 *** The installed version of Bison is too old to use with PostgreSQL.
 *** Bison version 1.875 or later is required." >&5
 echo "$as_me: WARNING:
 *** The installed version of Bison is too old to use with PostgreSQL.
 *** Bison version 1.875 or later is required." >&2;}
-      YACC=""
-    fi
+    YACC=""
   fi
+fi
 
-  if test -z "$YACC"; then
-    { echo "$as_me:$LINENO: WARNING:
+if test -z "$YACC"; then
+  { echo "$as_me:$LINENO: WARNING:
 *** Without Bison you will not be able to build PostgreSQL from CVS nor
 *** change any of the parser definition files.  You can obtain Bison from
 *** a GNU mirror site.  (If you are using the official distribution of
@@ -5125,8 +5058,84 @@ echo "$as_me: WARNING:
 *** output is pre-generated.)  To use a different yacc program (possible,
 *** but not recommended), set the environment variable YACC before running
 *** 'configure'." >&2;}
-  fi
 fi
+# We don't need AC_SUBST(YACC) because AC_PATH_PROG did it
+
+
+echo "$as_me:$LINENO: checking for flex" >&5
+echo $ECHO_N "checking for flex... $ECHO_C" >&6
+if test "${pgac_cv_path_flex+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  # Let the user override the test
+if test -n "$FLEX"; then
+  pgac_cv_path_flex=$FLEX
+else
+  pgac_save_IFS=$IFS
+  IFS=$PATH_SEPARATOR
+  for pgac_dir in $PATH; do
+    IFS=$pgac_save_IFS
+    if test -z "$pgac_dir" || test x"$pgac_dir" = x"."; then
+      pgac_dir=`pwd`
+    fi
+    for pgac_prog in flex lex; do
+      pgac_candidate="$pgac_dir/$pgac_prog"
+      if test -f "$pgac_candidate" \
+        && $pgac_candidate --version </dev/null >/dev/null 2>&1
+      then
+        echo '%%'  > conftest.l
+        if $pgac_candidate -t conftest.l 2>/dev/null | grep FLEX_SCANNER >/dev/null 2>&1; then
+          if $pgac_candidate --version | grep ' 2\.5\.3$' >/dev/null 2>&1; then
+            pgac_broken_flex=$pgac_candidate
+            continue
+          fi
+
+          pgac_cv_path_flex=$pgac_candidate
+          break 2
+        fi
+      fi
+    done
+  done
+  rm -f conftest.l lex.yy.c
+  : ${pgac_cv_path_flex=no}
+fi
+
+fi
+echo "$as_me:$LINENO: result: $pgac_cv_path_flex" >&5
+echo "${ECHO_T}$pgac_cv_path_flex" >&6
+if test x"$pgac_cv_path_flex" = x"no"; then
+  if test -n "$pgac_broken_flex"; then
+    { echo "$as_me:$LINENO: WARNING:
+*** The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
+*** should get version 2.5.4 or later." >&5
+echo "$as_me: WARNING:
+*** The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
+*** should get version 2.5.4 or later." >&2;}
+  fi
+
+  { echo "$as_me:$LINENO: WARNING:
+*** Without Flex you will not be able to build PostgreSQL from CVS or
+*** change any of the scanner definition files.  You can obtain Flex from
+*** a GNU mirror site.  (If you are using the official distribution of
+*** PostgreSQL then you do not need to worry about this because the Flex
+*** output is pre-generated.)" >&5
+echo "$as_me: WARNING:
+*** Without Flex you will not be able to build PostgreSQL from CVS or
+*** change any of the scanner definition files.  You can obtain Flex from
+*** a GNU mirror site.  (If you are using the official distribution of
+*** PostgreSQL then you do not need to worry about this because the Flex
+*** output is pre-generated.)" >&2;}
+
+  FLEX=
+else
+  FLEX=$pgac_cv_path_flex
+  pgac_flex_version=`$FLEX -V 2>/dev/null`
+  { echo "$as_me:$LINENO: using $pgac_flex_version" >&5
+echo "$as_me: using $pgac_flex_version" >&6;}
+fi
+
+
+
 
 
 # Extract the first word of "perl", so it can be a program name with args.
@@ -25180,22 +25189,22 @@ s,@with_zlib@,$with_zlib,;t t
 s,@EGREP@,$EGREP,;t t
 s,@ELF_SYS@,$ELF_SYS,;t t
 s,@LDFLAGS_SL@,$LDFLAGS_SL,;t t
-s,@AWK@,$AWK,;t t
-s,@FLEX@,$FLEX,;t t
-s,@FLEXFLAGS@,$FLEXFLAGS,;t t
-s,@LN_S@,$LN_S,;t t
 s,@LD@,$LD,;t t
 s,@with_gnu_ld@,$with_gnu_ld,;t t
 s,@ld_R_works@,$ld_R_works,;t t
 s,@RANLIB@,$RANLIB,;t t
 s,@ac_ct_RANLIB@,$ac_ct_RANLIB,;t t
-s,@TAR@,$TAR,;t t
 s,@STRIP@,$STRIP,;t t
 s,@ac_ct_STRIP@,$ac_ct_STRIP,;t t
 s,@STRIP_STATIC_LIB@,$STRIP_STATIC_LIB,;t t
 s,@STRIP_SHARED_LIB@,$STRIP_SHARED_LIB,;t t
+s,@TAR@,$TAR,;t t
+s,@LN_S@,$LN_S,;t t
+s,@AWK@,$AWK,;t t
 s,@YACC@,$YACC,;t t
 s,@YFLAGS@,$YFLAGS,;t t
+s,@FLEX@,$FLEX,;t t
+s,@FLEXFLAGS@,$FLEXFLAGS,;t t
 s,@PERL@,$PERL,;t t
 s,@perl_archlibexp@,$perl_archlibexp,;t t
 s,@perl_privlibexp@,$perl_privlibexp,;t t
diff --git a/configure.in b/configure.in
index c0fe700f62b..157ea944979 100644
--- a/configure.in
+++ b/configure.in
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-dnl $PostgreSQL: pgsql/configure.in,v 1.521 2007/07/14 11:13:28 mha Exp $
+dnl $PostgreSQL: pgsql/configure.in,v 1.522 2007/07/19 17:15:30 tgl Exp $
 dnl
 dnl Developers, please strive to achieve this order:
 dnl
@@ -650,9 +650,6 @@ AC_MSG_NOTICE([using LDFLAGS=$LDFLAGS])
 
 AC_ARG_VAR(LDFLAGS_SL)
 
-AC_PROG_AWK
-PGAC_PATH_FLEX
-AC_PROG_LN_S
 PGAC_PROG_LD
 AC_SUBST(LD)
 AC_SUBST(with_gnu_ld)
@@ -667,33 +664,14 @@ case $host_os in sysv5*)
   AC_SUBST(ld_R_works)
 esac
 AC_PROG_RANLIB
-AC_PATH_PROG(TAR, tar)
 PGAC_CHECK_STRIP
 
-if test -z "$YACC"; then
-  AC_CHECK_PROGS(YACC, ['bison -y'])
+AC_PATH_PROG(TAR, tar)
+AC_PROG_LN_S
+AC_PROG_AWK
 
-  if test "$YACC"; then
-    if $YACC --version | sed q | $AWK '{ if ($4 < 1.875) exit 0; else exit 1;}'; then
-      AC_MSG_WARN([
-*** The installed version of Bison is too old to use with PostgreSQL.
-*** Bison version 1.875 or later is required.])
-      YACC=""
-    fi
-  fi
-
-  if test -z "$YACC"; then
-    AC_MSG_WARN([
-*** Without Bison you will not be able to build PostgreSQL from CVS nor
-*** change any of the parser definition files.  You can obtain Bison from
-*** a GNU mirror site.  (If you are using the official distribution of
-*** PostgreSQL then you do not need to worry about this, because the Bison
-*** output is pre-generated.)  To use a different yacc program (possible,
-*** but not recommended), set the environment variable YACC before running
-*** 'configure'.])
-  fi
-fi
-AC_SUBST(YFLAGS)
+PGAC_PATH_YACC
+PGAC_PATH_FLEX
 
 PGAC_PATH_PERL
 if test "$with_perl" = yes; then