From cee7c2e1f36dca30cbc5d2f3e5221fc890ad8f0e Mon Sep 17 00:00:00 2001
From: Luke Dashjr <luke-jr+git@utopios.org>
Date: Sat, 6 Jun 2015 14:23:38 +0000
Subject: [PATCH] configure: Detect (and reject) LibreSSL

Rebased-From: a5a81f7354b3aa3e797d973a7e6840f0e50e6533
Github-Pull: #6244
---
 configure.ac | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/configure.ac b/configure.ac
index 8ba50a6ba..88feafb75 100644
--- a/configure.ac
+++ b/configure.ac
@@ -701,6 +701,14 @@ else
   fi
 fi
 
+AC_CHECK_LIB([crypto],[RAND_egd],[],[
+  AC_ARG_WITH([libressl],
+    [AS_HELP_STRING([--with-libressl],[Build with system LibreSSL (default is no; DANGEROUS; NOT SUPPORTED)])],
+    [AC_MSG_WARN([Detected LibreSSL: This is NOT supported, and may break consensus compatibility!])],
+    [AC_MSG_ERROR([Detected LibreSSL: This is NOT supported, and may break consensus compatibility!])]
+  )
+])
+
 CFLAGS_TEMP="$CFLAGS"
 LIBS_TEMP="$LIBS"
 CFLAGS="$CFLAGS $SSL_CFLAGS $CRYPTO_CFLAGS"