diff -urN povray-3.6.1/unix/config.h povray-3.6.1-ww/unix/config.h
--- povray-3.6.1/unix/config.h	2004-07-18 12:16:27.000000000 +0200
+++ povray-3.6.1-ww/unix/config.h	2004-08-11 19:51:28.000000000 +0200
@@ -159,9 +159,9 @@
 /*
  * POVMS stuff.
  */
-#define POVRAY_BEGIN_COOPERATE  if(setjmp(globalSetJmpEnv) == 0) {
-#define POVRAY_END_COOPERATE    }
-#define EXIT_POVRAY(n)          longjmp(globalSetJmpEnv, 1)
+#define POVRAY_BEGIN_COOPERATE  int _rv=setjmp(globalSetJmpEnv); if(_rv==0) {
+#define POVRAY_END_COOPERATE    } else if(_rv!=1) throw (_rv-1000000);
+#define EXIT_POVRAY(n)          longjmp(globalSetJmpEnv, n ? (n+1000000) : 1)
 
 /*
  * Namespace.