diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 206bd435858..45098d95c0f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2006-11-13  Jakub Jelinek  <jakub@redhat.com>
+
+	* configure.ac: Add changequote around __LONG_DOUBLE_MATH_OPTIONAL
+	test.
+	* configure: Rebuilt.
+
 2006-11-13  Andrew Pinski  <andrew_pinski@playstation.sony.com>
 
 	* config/rs6000/cell.md: New file.
diff --git a/gcc/configure b/gcc/configure
index d0e027b728f..55e5ac85d79 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -18255,9 +18255,10 @@ else
       else
 	glibc_header_dir=/usr/include
       fi
-      grep '^ 	*#[ 	]*define[ 	][ 	]*__LONG_DOUBLE_MATH_OPTIONAL' \
+      grep '^[ 	]*#[ 	]*define[ 	][ 	]*__LONG_DOUBLE_MATH_OPTIONAL' \
         $glibc_header_dir/bits/wordsize.h > /dev/null 2>&1 \
       && gcc_cv_target_ldbl128=yes
+
 fi
 
     ;;
diff --git a/gcc/configure.ac b/gcc/configure.ac
index b50b6c82502..ae336d728b4 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -3353,9 +3353,12 @@ case "$target" in
       else
 	glibc_header_dir=/usr/include
       fi
+changequote(,)dnl
       grep '^[ 	]*#[ 	]*define[ 	][ 	]*__LONG_DOUBLE_MATH_OPTIONAL' \
         $glibc_header_dir/bits/wordsize.h > /dev/null 2>&1 \
-      && gcc_cv_target_ldbl128=yes])
+      && gcc_cv_target_ldbl128=yes
+changequote([,])dnl
+      ])
     ;;
 esac
 if test x$gcc_cv_target_ldbl128 = xyes; then