From 340d00bf9910ed55163be26435f70baf65a64f9d Mon Sep 17 00:00:00 2001
From: Matthias Andree <matthias.andree@gmx.de>
Date: Sat, 20 Nov 2021 11:37:13 +0100
Subject: LibreSSL: block, due to licensing issue.

See COPYING or NEWS.
---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 14760f3a..ba21272d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -813,6 +813,9 @@ fi
 AC_MSG_NOTICE([LIBS:] "$LIBS")
 
 case "$LIBS" in *-lssl*|*libssl*)
+	AC_CHECK_DECLS([LIBRESSL_VERSION_NUMBER],
+		       AC_MSG_ERROR([fetchmail cannot legally be linked against LibreSSL for lack of GPL2 clause 2b exception. See COPYING.]),,
+	       	       [#include <openssl/ssl.h>])
 	AC_CHECK_DECLS([TLS1_3_VERSION],,
 		       AC_MSG_WARN([Your OpenSSL version is too old and does not support TLS v1.3. Upgrade.]),
 		       [#include <openssl/ssl.h>])
-- 
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