diff -up mozilla/toolkit/xre/nsAppRunner.cpp.elif mozilla/toolkit/xre/nsAppRunner.cpp
--- mozilla/toolkit/xre/nsAppRunner.cpp.elif	2009-08-25 10:57:48.000000000 +0200
+++ mozilla/toolkit/xre/nsAppRunner.cpp	2009-08-25 10:57:50.000000000 +0200
@@ -1370,7 +1370,7 @@ XRE_GetBinaryPath(const char* argv0, nsI
   if (NS_FAILED(rv))
     return rv;
 
-#elif
+#else
 #error Oops, you need platform-specific code here
 #endif