From b445940e2d891a72a7d623bc7efa7649e19863e6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20Mart=C3=ADn=20Nieto?= <cmn@dwim.me>
Date: Wed, 19 Aug 2015 12:53:31 +0200
Subject: [PATCH] CMake: fall back to OpenSSL on older OS X

Starting at OS X 10.8, the Security framework offers some functions
which are unified across OS X and iOS. These are the functions that we
use.

Older versions of OS X do not have these functions and we fail to
compile. In these situations, fall back to using OpenSSL for our TLS
stream instead.
---
 CMakeLists.txt | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b6a8b6d4e..6c03c718c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -152,8 +152,18 @@ STRING(REGEX REPLACE "^.*LIBGIT2_SOVERSION ([0-9]+)$" "\\1" LIBGIT2_SOVERSION "$
 INCLUDE_DIRECTORIES(src include)
 
 IF (SECURITY_FOUND)
-  MESSAGE("-- Found Security ${SECURITY_DIRS}")
-  LIST(APPEND LIBGIT2_PC_LIBS "-framework Security")
+  # OS X 10.7 and older do not have some functions we use, fall back to OpenSSL there
+  CHECK_LIBRARY_EXISTS("${SECURITY_DIRS}" SSLCreateContext "Security/SecureTransport.h" HAVE_NEWER_SECURITY)
+  IF (HAVE_NEWER_SECURITY)
+    MESSAGE("-- Found Security ${SECURITY_DIRS}")
+    LIST(APPEND LIBGIT2_PC_LIBS "-framework Security")
+  ELSE()
+    MESSAGE("-- Security framework is too old, falling back to OpenSSL")
+    SET(SECURITY_FOUND "NO")
+    SET(SECURITY_DIRS "")
+    SET(SECURITY_DIR "")
+    SET(USE_OPENSSL "ON")
+  ENDIF()
 ENDIF()
 
 IF (COREFOUNDATION_FOUND)