+# Check whether --with-included-regex or --without-included-regex was given.
+if test "${with_included_regex+set}" = set; then
+ withval="$with_included_regex"
+ case "${withval}" in
+ yes) want_included_regex=true ;;
+ no) want_included_regex=false;;
+ *) { echo "configure: error: bad value ${withval} for GDB with-included-regex option" 1>&2; exit 1; } ;;
+esac
+else
+ want_included_regex=true
+fi
+
+if test $want_included_regex = false; then
+ echo $ac_n "checking for GNU regex""... $ac_c" 1>&6
+echo "configure:5591: checking for GNU regex" >&5
+ if eval "test \"`echo '$''{'gdb_cv_have_gnu_regex'+set}'`\" = set"; then
+ echo $ac_n "(cached) $ac_c" 1>&6
+else
+ cat > conftest.$ac_ext <<EOF
+#line 5596 "configure"
+#include "confdefs.h"
+#include <gnu-versions.h>
+#include <sys/types.h>
+#include <regex.h>
+int main() {
+#if !defined _GNU_REGEX_INTERFACE_VERSION || !defined __GLIBC__ || __GLIBC__ < 2
+#error No valid GNU regex.
+#endif
+
+; return 0; }
+EOF
+if { (eval echo configure:5608: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+ rm -rf conftest*
+ gdb_cv_have_gnu_regex=yes
+else
+ echo "configure: failed program was:" >&5
+ cat conftest.$ac_ext >&5
+ rm -rf conftest*
+ gdb_cv_have_gnu_regex=no
+fi
+rm -f conftest*
+fi
+
+ echo "$ac_t""$gdb_cv_have_gnu_regex" 1>&6
+ if test $gdb_cv_have_gnu_regex = no; then
+ want_included_regex=true
+ fi
+fi
+
+if test x${want_included_regex} = xtrue; then
+ REGEX="gnu-regex.o"
+ cat >> confdefs.h <<\EOF
+#define USE_INCLUDED_REGEX 1
+EOF
+
+fi
+