From 4627ea0fc72fad7917a2b661c527aa1176bc90b0 Mon Sep 17 00:00:00 2001
From: Kees Monshouwer <mind04@monshouwer.org>
Date: Wed, 11 May 2016 16:47:06 +0200
Subject: [PATCH] check for OpenSSL ecdsa support

---
 m4/ax_check_openssl.m4 | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/m4/ax_check_openssl.m4 b/m4/ax_check_openssl.m4
index 7dd4cc1a02..b9e45fbf2d 100644
--- a/m4/ax_check_openssl.m4
+++ b/m4/ax_check_openssl.m4
@@ -109,7 +109,20 @@ AC_DEFUN([AX_CHECK_OPENSSL], [
         [AC_LANG_PROGRAM([#include <openssl/crypto.h>], [CRYPTO_free(NULL)])],
         [
             AC_MSG_RESULT([yes])
-            $1
+            openssl_ecdsa=yes
+            AC_CHECK_FUNC(ECDSA_do_sign,
+            [
+                AC_CHECK_DECLS([NID_X9_62_prime256v1, NID_secp384r1], [ : ], [ openssl_ecdsa=no ], [AC_INCLUDES_DEFAULT
+#include <openssl/evp.h>
+                ])
+            ], [
+                openssl_ecdsa=no
+            ])
+            AS_IF([test "x$openssl_ecdsa" = "xyes"], [
+              $1
+            ], [
+              $2
+            ])
         ], [
             AC_MSG_RESULT([no])
             $2
-- 
2.47.2