--- configure.in.old	2011-08-25 18:51:45.000000000 +0200
+++ configure.in	2011-08-29 14:29:38.000000000 +0200
@@ -5093,13 +5093,20 @@ if test -n "$with_system_mozilla" && tes
       PKG_CHECK_MODULES( MOZ_NSPR, $MOZ_FLAVOUR-nspr )
     fi
 
-    if test "$MOZ_FLAVOUR" != "libxul"; then
+    WITH_MOZILLA_XUL=YES
+    if test "$MOZ_FLAVOUR" = "mozilla"; then
+        # firefox changed the development model, so there is not longer a stable API
+        # some distros provide only mozilla-nss and mozilla-nspr but not the XUL stuff
+        PKG_CHECK_EXISTS($MOZ_FLAVOUR-xpcom, , [WITH_MOZILLA_XUL=NO])
+    fi
+
+    if test "$MOZ_FLAVOUR" != "libxul" -a "$WITH_MOZILLA_XUL" = "YES" ; then
       PKG_CHECK_MODULES( MOZILLAXPCOM, $MOZ_FLAVOUR-xpcom, HASXPCOM="TRUE", HASXPCOM="" )
       MOZ_INC=`$PKG_CONFIG --variable=includedir $MOZ_FLAVOUR-xpcom`
       MOZ_LIB=`$PKG_CONFIG --variable=libdir $MOZ_FLAVOUR-xpcom`
     fi
 
-    if test -z "$HASXPCOM"; then
+    if test -z "$HASXPCOM" -a "$WITH_MOZILLA_XUL" = "YES" ; then
       PKG_CHECK_MODULES( MOZILLAXPCOM, libxul )
       MOZ_INC=`$PKG_CONFIG --variable=includedir libxul`
       MOZ_LIB=`$PKG_CONFIG --variable=libdir libxul`
@@ -5327,6 +5332,7 @@ AC_SUBST(ENABLE_NSS_MODULE)
 AC_SUBST(MOZILLABUILD)
 AC_SUBST(SYSTEM_MOZILLA)
 AC_SUBST(MOZ_FLAVOUR)
+AC_SUBST(WITH_MOZILLA_XUL)
 AC_SUBST(MOZ_INC)
 AC_SUBST(MOZ_LIB)
 AC_SUBST(MOZ_LIB_XPCOM)
--- set_soenv.in.old	2011-08-25 18:51:45.000000000 +0200
+++ set_soenv.in	2011-08-29 14:52:00.000000000 +0200
@@ -1411,7 +1411,7 @@ elsif ($platform =~ m/darwin/)
 
 }
 
-if ($SYSTEM_MOZILLA eq "YES")
+if ($SYSTEM_MOZILLA eq "YES" && "@MOZ_LIB@" ne "")
 {
        $SOLARLIB .= $L."@MOZ_LIB@"
 }
@@ -1892,6 +1892,7 @@ ToFile( "WITH_OPENLDAP",     "@WITH_OPEN
 ToFile( "WITH_MOZILLA",      "@WITH_MOZILLA@",     "e" );
 ToFile( "SYSTEM_MOZILLA",    "@SYSTEM_MOZILLA@",   "e" );
 ToFile( "MOZ_FLAVOUR",       "@MOZ_FLAVOUR@",      "e" );
+ToFile( "WITH_MOZILLA_XUL",  "@WITH_MOZILLA_XUL@", "e" );
 ToFile( "NSPR_LIB",          "@NSPR_LIB@",         "e" );
 ToFile( "NSS_LIB",           "@NSS_LIB@",          "e" );
 ToFile( "MOZ_INC",           "@MOZ_INC@",          "e" );