diff --git a/configure.ac b/configure.ac
index 434da55..a89b062 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5650,8 +5650,8 @@ then
           [
             AC_PATH_PROGS(MOZILLA_CONFIG,
 	    [mozilla-config seamonkey-config xulrunner-config],
-            AC_MSG_ERROR([Please install the Mozilla development tools. mozilla-config was not found.])
-		  )
+        [no])
+            test "${MOZILLA_CONFIG}" = "no" && AC_MSG_ERROR([Please install the Mozilla development tools. mozilla-config was not found.])
           ]
         )
     dnl pkg-config failed but we might have found a mozilla-config