optind seems to need unistd.h, not only getopt.h
--- e2fsprogs-1.42.12.orig/misc/e2undo.c	2014-07-03 16:33:48.000000000 +0200
+++ e2fsprogs-1.42.12/misc/e2undo.c	2015-02-24 13:53:30.092844203 +0100
@@ -20,6 +20,7 @@
 #if HAVE_ERRNO_H
 #include <errno.h>
 #endif
+#include <unistd.h>
 #include "ext2fs/tdb.h"
 #include "ext2fs/ext2fs.h"
 #include "nls-enable.h"