Use HAVE_ARC4RANDOM and choose to call arc4random() instead of srand()
and rand() and friends.

--- kpasswd/kpasswd-generator.c.orig	Tue Nov 29 02:35:27 2016
+++ kpasswd/kpasswd-generator.c	Thu Dec 15 11:30:30 2016
@@ -78,7 +78,7 @@ generate_requests(const char *filename, unsigned nreq)
 {
     krb5_context context;
     krb5_error_code ret;
-    int i;
+    int i, rnd;
     char **words;
     unsigned nwords, k;
 
@@ -89,7 +89,12 @@ generate_requests(const char *filename, unsigned nreq)
     nwords = read_words(filename, &words);
 
     for (i = 0; i < nreq; ++i) {
-	char *name = words[rand() % nwords];
+#ifdef HAVE_ARC4RANDOM
+	rnd = arc4random();
+#else
+	rnd = rand();
+#endif
+	char *name = words[rnd % nwords];
 	krb5_get_init_creds_opt *opt;
 	krb5_creds cred;
 	krb5_principal principal;
@@ -207,7 +212,9 @@ main(int argc, char **argv)
 
     if (argc != 2)
 	usage (1);
+#ifndef HAVE_ARC4RANDOM
     srand (0);
+#endif
     nreq = strtol(argv[1], &end, 0);
     if (argv[1] == end || *end != '\0')
 	usage (1);