diff -ru iup/src/win/iupwindows_main.c iup.patched/src/win/iupwindows_main.c
--- iup/src/win/iupwindows_main.c	2011-08-17 23:40:58.000000000 +0200
+++ iup.patched/src/win/iupwindows_main.c	2011-08-19 13:54:45.186511300 +0200
@@ -51,6 +51,11 @@
     extern char** _argv;
     return IupMain(_argc, _argv);
   }              
+#elif __CYGWIN__
+  {
+    /* unfortunately no __argc, __argv on cygwin */
+    return main(0, NULL);
+  }
 #else
   {                        
     /* this seems to work for all the compilers we tested, except Watcom compilers */