--- a/hedgewars/options.inc	Tue Jan 07 01:58:23 2014 +0400
+++ b/hedgewars/options.inc	Tue Jan 07 22:08:02 2014 +0400
@@ -30,7 +30,7 @@
 {$DEFINE USE_LUA_SCRIPT}
 
 {$IF DEFINED(WEBGL) AND NOT DEFINED(PAS2C)}
-{$UNDEF WEBGL}
+{$ERROR WEBGL defined, but PAS2C isn't}
 {$ENDIF}
 
 {$IFDEF WEBGL}