Robert P. Day removed 8 gazillion occurrences of "extern" on function
definitions.  (That should only be on prototypes.)
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index eeabf3f..682179a 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -22,7 +22,7 @@
 static char *linkname = NULL;
 #endif
 
-extern char get_header_tar(archive_handle_t *archive_handle)
+char get_header_tar(archive_handle_t *archive_handle)
 {
 	file_header_t *file_header = archive_handle->file_header;
 	union {