--- ntp-4.2.4p7/configure.ac.orig	2009-05-19 10:44:23.000000000 +0200
+++ ntp-4.2.4p7/configure.ac	2009-05-19 10:46:03.000000000 +0200
@@ -366,6 +366,7 @@
 AC_CHECK_FUNC([openlog], , 
   AC_SEARCH_LIBS([openlog], [gen], , 
   AC_SEARCH_LIBS([openlog], [syslog], , , [$libxnet -lsocket])))
+AC_SEARCH_LIBS([MD5_Init], [crypto])
 AC_SEARCH_LIBS([MD5Init], [md5 md])
 AC_CHECK_FUNCS(MD5Init)
 
--- ntp-4.2.0/include/ntp_md5.h	2003-07-17 13:27:16.000000000 +0300
+++ ntp-4.2.0.ssl/include/ntp_md5.h	2006-10-02 23:15:24.871129536 +0300
@@ -2,8 +2,15 @@
  * ntp_md5.h: deal with md5.h headers
  */
 
+#ifdef HAVE_LIBCRYPTO
+# include <openssl/md5.h>
+#define	MD5Update MD5_Update
+#define	MD5Final MD5_Final
+#define	MD5Init MD5_Init
+#else
 #ifdef HAVE_MD5_H
 # include <md5.h>
 #else
 # include "rsa_md5.h"
 #endif
+#endif
--- ntp-4.2.0/libntp/md5c.c~	2003-07-17 12:27:22.000000000 +0200
+++ ntp-4.2.0/libntp/md5c.c	2007-02-22 13:51:00.000000000 +0100
@@ -24,7 +24,7 @@
  */
 
 #include "global.h"
-#ifndef HAVE_MD5INIT
+#if !HAVE_MD5INIT && !HAVE_LIBCRYPTO
 #include "ntp_md5.h"
 
 /* Constants for MD5Transform routine.
--- ntp-4.2.4p7/configure.ac.orig	2009-08-08 16:46:22.000000000 +0200
+++ ntp-4.2.4p7/configure.ac	2009-08-08 17:52:24.000000000 +0200
@@ -427,17 +427,6 @@
 esac
 AC_CHECK_HEADERS(errno.h fcntl.h ieeefp.h math.h)
 
-# HMS: Lame, but fast.
-if test -f /etc/redhat-release
-then
-    :
-else
-    AC_CHECK_HEADERS(md5.h, [], [],
-[#if HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-])
-fi
 AC_CHECK_HEADERS(memory.h netdb.h poll.h)
 AC_CHECK_HEADERS(sched.h sgtty.h stdlib.h string.h termio.h)
 AC_CHECK_HEADERS(termios.h timepps.h timex.h unistd.h)