From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Wed, 30 Mar 2016 02:59:19 +0200
Subject: Support LibreSSL as provider of openssl

The build scripts check for openssl by grepping the string "OpenSSL" in
the output of openssl version command. LibreSSL fails this test as it
outputs something like "LibreSSL 2.2.4". This patch fix the
prereq-bulid.mk file so that it accepts LibreSSL as openssl provider as
well.

Signed-off-by: Marek Behun <kabel@blackhole.sk>

Backport of r48267

diff --git a/include/prereq-build.mk b/include/prereq-build.mk
index 32c4adabb748c4026d507d40769b3201e2ac5599..f36d57ce06c46be7ac33f3034ad08a3ce603089d 100644
--- a/include/prereq-build.mk
+++ b/include/prereq-build.mk
@@ -151,7 +151,7 @@ $(eval $(call SetupHostCommand,file,Please install the 'file' package, \
 	file --version 2>&1 | grep file))
 
 $(eval $(call SetupHostCommand,openssl,Please install the 'openssl' utility, \
-	openssl version | grep OpenSSL))
+	openssl version | grep '\(OpenSSL\|LibreSSL\)'))
 
 
 # Install ldconfig stub