diff --git a/configure.ac b/configure.ac
index f18199b..cd8c27c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-# $Id: configure.ac,v 1.421 2009/07/12 11:56:29 dtucker Exp $
+# $Id: configure.ac,v 1.422 2009/08/16 23:35:22 dtucker Exp $
 #
 # Copyright (c) 1999-2004 Damien Miller
 #
@@ -15,7 +15,7 @@
 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 AC_INIT(OpenSSH, Portable, openssh-unix-dev@mindrot.org)
-AC_REVISION($Revision: 1.421 $)
+AC_REVISION($Revision: 1.422 $)
 AC_CONFIG_SRCDIR([ssh.c])
 
 AC_CONFIG_HEADER(config.h)
@@ -982,6 +982,7 @@
 	fi ]
 )
 
+AC_CHECK_HEADER([zlib.h], ,AC_MSG_ERROR([*** zlib.h missing - please install first or check config.log ***]))
 AC_CHECK_LIB(z, deflate, ,
 	[
 		saved_CPPFLAGS="$CPPFLAGS"
@@ -1002,7 +1003,6 @@
 		)
 	]
 )
-AC_CHECK_HEADER([zlib.h], ,AC_MSG_ERROR([*** zlib.h missing - please install first or check config.log ***]))
 
 AC_ARG_WITH(zlib-version-check,
 	[  --without-zlib-version-check Disable zlib version check],
@@ -1895,6 +1895,8 @@
 			LDFLAGS="-L/usr/local/ssl/lib ${saved_LDFLAGS}"
 		fi
 		CPPFLAGS="-I/usr/local/ssl/include ${saved_CPPFLAGS}"
+		AC_CHECK_HEADER([openssl/opensslv.h], ,
+		    AC_MSG_ERROR([*** OpenSSL headers missing - please install first or check config.log ***]))
 		AC_TRY_LINK_FUNC(RAND_add, AC_DEFINE(HAVE_OPENSSL),
 			[
 				AC_MSG_ERROR([*** Can't find recent OpenSSL libcrypto (see config.log for details) ***])