Index: src/classes/env.pmc
===================================================================
--- src/classes/env.pmc	(revision 10505)
+++ src/classes/env.pmc	(working copy)
@@ -22,8 +22,12 @@
 #include "parrot/parrot.h"
 
 /* array of environment variables,
-   speced in POSIX.1, but not in ISO-C */
+   speced in POSIX.1, but not in ISO-C 
+   MS C compilers know about environ, as it is declared in stdlib.h.
+*/
+#ifndef _MSC_VER
 extern char **environ;
+#endif
 
 static PMC * Env_PMC;
 pmclass Env singleton {