diff -u -r ../busybox-1.29.1/libbb/pw_encrypt.c ./libbb/pw_encrypt.c
--- ../busybox-1.29.1/libbb/pw_encrypt.c	2018-07-02 11:23:06.000000000 +0000
+++ ./libbb/pw_encrypt.c	2018-07-22 23:43:48.620188017 +0000
@@ -6,7 +6,9 @@
  *
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
-#include <crypt.h>
+#if !ENABLE_USE_BB_CRYPT
+# include <crypt.h>
+#endif
 #include "libbb.h"
 
 /* static const uint8_t ascii64[] ALIGN1 =