diff -Naur libmcrypt-2.5.1/lib/mcrypt_modules.c libmcrypt-2.5.1.new/lib/mcrypt_modules.c
--- libmcrypt-2.5.1/lib/mcrypt_modules.c	2002-06-04 16:41:54 +0400
+++ libmcrypt-2.5.1.new/lib/mcrypt_modules.c	2002-06-04 16:41:34 +0400
@@ -25,6 +25,8 @@
 #include <mcrypt_internal.h>
 #include <xmemory.h>
 
+#include <dlfcn.h>
+
 #ifndef DEBUG
 # define fputs(x, y) 
 #endif