Fixes for -fno-common
https://github.com/rubund/graywolf/commit/f47937b66d4d44eafc4224f7c43d556dbf88f05b

Index: src/twsc/feeds.h
--- src/twsc/feeds.h.orig
+++ src/twsc/feeds.h
@@ -24,7 +24,7 @@ typedef struct feed_assgn_box {
 FEED_SEG ;
 
 EXTERN INT *feeds_in_rowG ;
-EXTERN INT *FeedInRowG ;
+extern INT *FeedInRowG ;
 EXTERN INT fdWidthG ;
 EXTERN INT *fdcel_addedG ;
 EXTERN INT **fdcel_needG ;
