Robert P. Day removed 8 gazillion occurrences of "extern" on function
definitions.  (That should only be on prototypes.)
diff --git a/editors/patch.c b/editors/patch.c
index 2248b61..9a37408 100644
--- a/editors/patch.c
+++ b/editors/patch.c
@@ -88,7 +88,7 @@
 	return(stat(filename, &statbuf));
 }
 
-extern int patch_main(int argc, char **argv)
+int patch_main(int argc, char **argv)
 {
 	int patch_level = -1;
 	char *patch_line;