From 2af9873259a4b55d774bf8848cc8847ca401132f Mon Sep 17 00:00:00 2001
From: Brent Cook <bcook@openbsd.org>
Date: Fri, 11 Sep 2015 09:11:08 -0500
Subject: add -lrt check for linux

---
 CMakeLists.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2aed0c9..ed9cb1f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,6 @@
 cmake_minimum_required (VERSION 2.8)
 include(CheckFunctionExists)
+include(CheckLibraryExists)
 include(CheckIncludeFiles)
 
 project (LibreSSL)
@@ -159,6 +160,12 @@ set(OPENSSL_LIBS ssl crypto)
 if(CMAKE_HOST_WIN32)
 	set(OPENSSL_LIBS ${OPENSSL_LIBS} ws2_32)
 endif()
+if(CMAKE_SYSTEM_NAME MATCHES "Linux")
+	check_library_exists(rt clock_gettime "time.h" HAVE_CLOCK_GETTIME)
+	if (HAVE_CLOCK_GETTIME)
+		set(OPENSSL_LIBS ${OPENSSL_LIBS} rt)
+	endif()
+endif()
 
 if(NOT (CMAKE_SYSTEM_NAME MATCHES "Darwin" OR MSVC))
 	set(BUILD_SHARED true)
-- 
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