diff --git a/libjava/classpath/ChangeLog.gcj b/libjava/classpath/ChangeLog.gcj
index 8a813baac12..e4d7c2fae3c 100644
--- a/libjava/classpath/ChangeLog.gcj
+++ b/libjava/classpath/ChangeLog.gcj
@@ -1,3 +1,8 @@
+2009-03-16  Matthias Klose  <doko@ubuntu.com>
+
+	* configure.ac: Detect xulrunner-1.9.
+	* configure: Regenerate.
+
 2009-02-03  Jakub Jelinek  <jakub@redhat.com>
 
 	* gnu/java/rmi/registry/RegistryImpl.java (version): Update
diff --git a/libjava/classpath/configure b/libjava/classpath/configure
index be3eb9153c7..466fa46bdba 100755
--- a/libjava/classpath/configure
+++ b/libjava/classpath/configure
@@ -23978,6 +23978,103 @@ esac
 fi
 PKG_CONFIG=$ac_cv_path_PKG_CONFIG
 
+if test -n "$PKG_CONFIG"; then
+  echo "$as_me:$LINENO: result: $PKG_CONFIG" >&5
+echo "${ECHO_T}$PKG_CONFIG" >&6
+else
+  echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6
+fi
+
+  fi
+
+  if test "$PKG_CONFIG" = "no" ; then
+     echo "*** The pkg-config script could not be found. Make sure it is"
+     echo "*** in your path, or set the PKG_CONFIG environment variable"
+     echo "*** to the full path to pkg-config."
+     echo "*** Or see http://www.freedesktop.org/software/pkgconfig to get pkg-config."
+  else
+     PKG_CONFIG_MIN_VERSION=0.9.0
+     if $PKG_CONFIG --atleast-pkgconfig-version $PKG_CONFIG_MIN_VERSION; then
+        echo "$as_me:$LINENO: checking for mozilla-plugin libxul-unstable" >&5
+echo $ECHO_N "checking for mozilla-plugin libxul-unstable... $ECHO_C" >&6
+
+        if $PKG_CONFIG --exists "mozilla-plugin libxul-unstable" ; then
+            echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6
+            succeeded=yes
+
+            echo "$as_me:$LINENO: checking MOZILLA_CFLAGS" >&5
+echo $ECHO_N "checking MOZILLA_CFLAGS... $ECHO_C" >&6
+            MOZILLA_CFLAGS=`$PKG_CONFIG --cflags "mozilla-plugin libxul-unstable"`
+            echo "$as_me:$LINENO: result: $MOZILLA_CFLAGS" >&5
+echo "${ECHO_T}$MOZILLA_CFLAGS" >&6
+
+            echo "$as_me:$LINENO: checking MOZILLA_LIBS" >&5
+echo $ECHO_N "checking MOZILLA_LIBS... $ECHO_C" >&6
+            MOZILLA_LIBS=`$PKG_CONFIG --libs "mozilla-plugin libxul-unstable"`
+            echo "$as_me:$LINENO: result: $MOZILLA_LIBS" >&5
+echo "${ECHO_T}$MOZILLA_LIBS" >&6
+        else
+            MOZILLA_CFLAGS=""
+            MOZILLA_LIBS=""
+            ## If we have a custom action on failure, don't print errors, but
+            ## do set a variable so people can do so.
+            MOZILLA_PKG_ERRORS=`$PKG_CONFIG --errors-to-stdout --print-errors "mozilla-plugin libxul-unstable"`
+
+        fi
+
+
+
+     else
+        echo "*** Your version of pkg-config is too old. You need version $PKG_CONFIG_MIN_VERSION or newer."
+        echo "*** See http://www.freedesktop.org/software/pkgconfig"
+     fi
+  fi
+
+  if test $succeeded = yes; then
+     MOZILLA_FOUND=yes
+  else
+     MOZILLA_FOUND=no
+  fi
+
+    if test "x${MOZILLA_FOUND}" = xno; then
+
+  succeeded=no
+
+  if test -z "$PKG_CONFIG"; then
+    # Extract the first word of "pkg-config", so it can be a program name with args.
+set dummy pkg-config; 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_PKG_CONFIG+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  case $PKG_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_PKG_CONFIG="$PKG_CONFIG" # 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_PKG_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+done
+
+  test -z "$ac_cv_path_PKG_CONFIG" && ac_cv_path_PKG_CONFIG="no"
+  ;;
+esac
+fi
+PKG_CONFIG=$ac_cv_path_PKG_CONFIG
+
 if test -n "$PKG_CONFIG"; then
   echo "$as_me:$LINENO: result: $PKG_CONFIG" >&5
 echo "${ECHO_T}$PKG_CONFIG" >&6
@@ -24038,6 +24135,7 @@ echo "${ECHO_T}$MOZILLA_LIBS" >&6
      MOZILLA_FOUND=no
   fi
 
+    fi
     if test "x${MOZILLA_FOUND}" = xno; then
 
   succeeded=no
@@ -29172,7 +29270,7 @@ EOF
 if uudecode$EXEEXT Test.uue; then
         ac_cv_prog_uudecode_base64=yes
 else
-        echo "configure: 29175: uudecode had trouble decoding base 64 file 'Test.uue'" >&5
+        echo "configure: 29273: uudecode had trouble decoding base 64 file 'Test.uue'" >&5
         echo "configure: failed file was:" >&5
         cat Test.uue >&5
         ac_cv_prog_uudecode_base64=no
@@ -29319,7 +29417,7 @@ else
 JAVA_TEST=Object.java
 CLASS_TEST=Object.class
 cat << \EOF > $JAVA_TEST
-/* #line 29322 "configure" */
+/* #line 29420 "configure" */
 package java.lang;
 
 public class Object
@@ -29368,7 +29466,7 @@ JAVA_TEST=Test.java
 CLASS_TEST=Test.class
 TEST=Test
 cat << \EOF > $JAVA_TEST
-/* [#]line 29371 "configure" */
+/* [#]line 29469 "configure" */
 public class Test {
 public static void main (String args[]) {
         System.exit (0);
@@ -29688,7 +29786,7 @@ else
 JAVA_TEST=Object.java
 CLASS_TEST=Object.class
 cat << \EOF > $JAVA_TEST
-/* #line 29691 "configure" */
+/* #line 29789 "configure" */
 package java.lang;
 
 public class Object
@@ -29729,7 +29827,7 @@ fi
   JAVA_TEST=Test.java
   CLASS_TEST=Test.class
   cat << \EOF > $JAVA_TEST
-  /* #line 29732 "configure" */
+  /* #line 29830 "configure" */
   public class Test
   {
     public static void main(String args)
diff --git a/libjava/classpath/configure.ac b/libjava/classpath/configure.ac
index faf3ab7ce36..53a56fa5e0f 100644
--- a/libjava/classpath/configure.ac
+++ b/libjava/classpath/configure.ac
@@ -771,7 +771,10 @@ if test "x${COMPILE_JNI}" = xyes; then
 
   dnl Check for plugin support headers and libraries.
   if test "x${COMPILE_PLUGIN}" = xyes; then
-    PKG_CHECK_MODULES(MOZILLA, mozilla-plugin, [MOZILLA_FOUND=yes], [MOZILLA_FOUND=no])
+    PKG_CHECK_MODULES(MOZILLA, mozilla-plugin libxul-unstable, [MOZILLA_FOUND=yes], [MOZILLA_FOUND=no])
+    if test "x${MOZILLA_FOUND}" = xno; then
+      PKG_CHECK_MODULES(MOZILLA, mozilla-plugin, [MOZILLA_FOUND=yes], [MOZILLA_FOUND=no])
+    fi
     if test "x${MOZILLA_FOUND}" = xno; then
       PKG_CHECK_MODULES(MOZILLA, firefox-plugin firefox-xpcom, [MOZILLA_FOUND=yes], [MOZILLA_FOUND=no])
     fi