diff --git a/configure b/configure
index ca5904086a..2d277dde6d 100755
--- a/configure
+++ b/configure
@@ -11079,7 +11079,8 @@ fi
 
 
 
-for ac_func in fseeko gethostname getopt_long getrusage inet_aton random rint srandom strcasecmp strdup strerror strtol strtoul
+
+for ac_func in crypt fseeko gethostname getopt_long getrusage inet_aton random rint srandom strcasecmp strdup strerror strtol strtoul
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 echo "$as_me:$LINENO: checking for $ac_func" >&5