Robert P. Day removed 8 gazillion occurrences of "extern" on function
definitions.  (That should only be on prototypes.)
diff --git a/archival/gunzip.c b/archival/gunzip.c
index 76738b0..4fb7704 100644
--- a/archival/gunzip.c
+++ b/archival/gunzip.c
@@ -75,7 +75,7 @@
 #define GUNZIP_OPT_TEST		4
 #define GUNZIP_OPT_DECOMPRESS	8
 
-extern int gunzip_main(int argc, char **argv)
+int gunzip_main(int argc, char **argv)
 {
 	char status = EXIT_SUCCESS;
 	unsigned long opt;