diff --git a/crypt.c b/crypt.c
--- a/crypt.c
+++ b/crypt.c
@@ -6,7 +6,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
+#include <unistd.h>
+
+#ifndef NO_CRYPT
 #include <crypt.h>
+#endif
 
 #define GETRANDOM(max) ('a'+(int)((float)(max)*rand()/RAND_MAX+1.0))