--- a/toolkit/xre/nsAppRunner.cpp	2010-02-04 14:57:10.363464487 +0800
+++ b/toolkit/xre/nsAppRunner.cpp	2010-02-04 14:57:22.452336661 +0800
@@ -2600,7 +2600,7 @@
  * By defining the symbol here, we can avoid the wasted lookup and hopefully
  * improve startup performance.
  */
-PRBool nspr_use_zone_allocator = PR_FALSE;
+NS_VISIBILITY_DEFAULT PRBool nspr_use_zone_allocator = PR_FALSE;
 
 #ifdef MOZ_SPLASHSCREEN
 #define MOZ_SPLASHSCREEN_UPDATE(_i)  do { if (splashScreen) splashScreen->Update(_i); } while(0)