From a87832e357795ed84de9cb65d007c2d6c2b93d54 Mon Sep 17 00:00:00 2001
From: Jack Andersen <jackoalan@gmail.com>
Date: Fri, 8 Jan 2016 16:00:08 -1000
Subject: [PATCH] CMAKE_OSX_SYSROOT validation

---
 atdna/CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/atdna/CMakeLists.txt b/atdna/CMakeLists.txt
index 2cd3545..1ac279c 100644
--- a/atdna/CMakeLists.txt
+++ b/atdna/CMakeLists.txt
@@ -167,6 +167,9 @@ macro(atdna out)
 
   # OSX Extra
   elseif(APPLE)
+    if (NOT EXISTS "${CMAKE_OSX_SYSROOT}")
+      message(FATAL_ERROR "CMAKE_OSX_SYSROOT not set")
+    endif()
     list(APPEND extraargs -isysroot ${CMAKE_OSX_SYSROOT} -I ${CMAKE_OSX_SYSROOT}/usr/include -isysroot
          ${CMAKE_OSX_SYSROOT}/../../../../../Toolchains/XcodeDefault.xctoolchain)
   endif()