Add test for netinet/ip6.h and getaddrinfo, to enable IPv6.

configure

@@ -10028,6 +10028,108 @@ fi
 echo "$as_me:$LINENO: result: $ac_cv_func_getaddrinfo" >&5
 echo "${ECHO_T}$ac_cv_func_getaddrinfo" >&6
 if test $ac_cv_func_getaddrinfo = yes; then
+  if test "${ac_cv_header_netinet_ip6_h+set}" = set; then
+  echo "$as_me:$LINENO: checking for netinet/ip6.h" >&5
+echo $ECHO_N "checking for netinet/ip6.h... $ECHO_C" >&6
+if test "${ac_cv_header_netinet_ip6_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+echo "$as_me:$LINENO: result: $ac_cv_header_netinet_ip6_h" >&5
+echo "${ECHO_T}$ac_cv_header_netinet_ip6_h" >&6
+else
+  # Is the header compilable?
+echo "$as_me:$LINENO: checking netinet/ip6.h usability" >&5
+echo $ECHO_N "checking netinet/ip6.h usability... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+#line $LINENO "configure"
+#include "confdefs.h"
+$ac_includes_default
+#include <netinet/ip6.h>
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+         { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_header_compiler=yes
+else
+  echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+ac_header_compiler=no
+fi
+rm -f conftest.$ac_objext conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
+echo "${ECHO_T}$ac_header_compiler" >&6
+
+# Is the header present?
+echo "$as_me:$LINENO: checking netinet/ip6.h presence" >&5
+echo $ECHO_N "checking netinet/ip6.h presence... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+#line $LINENO "configure"
+#include "confdefs.h"
+#include <netinet/ip6.h>
+_ACEOF
+if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
+  (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1
+  ac_status=$?
+  egrep -v '^ *\+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } >/dev/null; then
+  if test -s conftest.err; then
+    ac_cpp_err=$ac_c_preproc_warn_flag
+  else
+    ac_cpp_err=
+  fi
+else
+  ac_cpp_err=yes
+fi
+if test -z "$ac_cpp_err"; then
+  ac_header_preproc=yes
+else
+  echo "$as_me: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  ac_header_preproc=no
+fi
+rm -f conftest.err conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
+echo "${ECHO_T}$ac_header_preproc" >&6
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc in
+  yes:no )
+    { echo "$as_me:$LINENO: WARNING: netinet/ip6.h: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: netinet/ip6.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: netinet/ip6.h: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: netinet/ip6.h: proceeding with the preprocessor's result" >&2;};;
+  no:yes )
+    { echo "$as_me:$LINENO: WARNING: netinet/ip6.h: present but cannot be compiled" >&5
+echo "$as_me: WARNING: netinet/ip6.h: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: netinet/ip6.h: check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: netinet/ip6.h: check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: netinet/ip6.h: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: netinet/ip6.h: proceeding with the preprocessor's result" >&2;};;
+esac
+echo "$as_me:$LINENO: checking for netinet/ip6.h" >&5
+echo $ECHO_N "checking for netinet/ip6.h... $ECHO_C" >&6
+if test "${ac_cv_header_netinet_ip6_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_cv_header_netinet_ip6_h=$ac_header_preproc
+fi
+echo "$as_me:$LINENO: result: $ac_cv_header_netinet_ip6_h" >&5
+echo "${ECHO_T}$ac_cv_header_netinet_ip6_h" >&6
+
+fi
+if test $ac_cv_header_netinet_ip6_h = yes; then
   HAVE_IPV6="yes"; cat >>confdefs.h <<\_ACEOF
 #define HAVE_IPV6 1
 _ACEOF
@@ -10035,6 +10137,9 @@ _ACEOF
 fi
 
 
+fi
+
+
 
 echo "$as_me:$LINENO: checking for PS_STRINGS" >&5
 echo $ECHO_N "checking for PS_STRINGS... $ECHO_C" >&6

configure.in

 dnl Process this file with autoconf to produce a configure script.
-dnl $Header: /cvsroot/pgsql/configure.in,v 1.226 2003/01/06 05:46:18 momjian Exp $
+dnl $Header: /cvsroot/pgsql/configure.in,v 1.227 2003/01/06 06:06:04 momjian Exp $
 dnl
 dnl Developers, please strive to achieve this order:
 dnl
@@ -788,7 +788,9 @@ AC_CHECK_DECLS(fdatasync, [], [], [#include <unistd.h>])
 
 # This exports HAVE_IPV6 to both C files and Makefiles
 AC_CHECK_FUNC(getaddrinfo,
-             [HAVE_IPV6="yes"; AC_DEFINE(HAVE_IPV6, 1, [])], [])
+	     [AC_CHECK_HEADER(netinet/ip6.h,
+	     [HAVE_IPV6="yes"; AC_DEFINE(HAVE_IPV6, 1, [])], 
+	     [])])
 AC_SUBST(HAVE_IPV6)
 
 AC_CACHE_CHECK([for PS_STRINGS], [pgac_cv_var_PS_STRINGS],