Added declaration for mkvalue()
diff --git a/Include/modsupport.h b/Include/modsupport.h
index 552c404..28821d9 100644
--- a/Include/modsupport.h
+++ b/Include/modsupport.h
@@ -26,6 +26,7 @@
 
 extern object *initmodule PROTO((char *, struct methodlist *));
 extern int getargs PROTO((object *, char *, ...));
+extern object *mkvalue PROTO((char *, ...));
 
 #define getnoarg(v) getargs(v, "")
 #define getintarg(v, a) getargs(v, "i", a)