From d960ced6e105c423f22a206e8525550a541a5d3e Mon Sep 17 00:00:00 2001
From: David Capello <davidcapello@gmail.com>
Date: Thu, 31 Mar 2016 17:40:35 -0300
Subject: [PATCH] Fix pnglibconf.c compilation on OS X including the sysroot
 path

Without these flags pnglibconf.c compilation fails because it
includes zlib.h -> zconf.h -> sys/types.h which is not found until we
give a correct SDK path with -isysroot flag.
---
 scripts/genout.cmake.in | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/scripts/genout.cmake.in b/scripts/genout.cmake.in
index d57810b22..ba9b96ff5 100644
--- a/scripts/genout.cmake.in
+++ b/scripts/genout.cmake.in
@@ -22,6 +22,13 @@ set(PNGLIB_MINOR "@PNGLIB_MINOR@")
 set(PNGLIB_VERSION "@PNGLIB_VERSION@")
 set(ZLIBINCDIR "@ZLIB_INCLUDE_DIR@")
 
+set(PLATFORM_C_FLAGS)
+if(APPLE)
+  set(CMAKE_OSX_ARCHITECTURES "@CMAKE_OSX_ARCHITECTURES@")
+  set(CMAKE_OSX_SYSROOT "@CMAKE_OSX_SYSROOT@")
+  set(PLATFORM_C_FLAGS -arch ${CMAKE_OSX_ARCHITECTURES} -isysroot ${CMAKE_OSX_SYSROOT})
+endif()
+
 get_filename_component(INPUTEXT "${INPUT}" EXT)
 get_filename_component(OUTPUTEXT "${OUTPUT}" EXT)
 get_filename_component(INPUTBASE "${INPUT}" NAME_WE)
@@ -46,6 +53,7 @@ if ("${INPUTEXT}" STREQUAL ".c" AND "${OUTPUTEXT}" STREQUAL ".out")
 
   execute_process(COMMAND "${CMAKE_C_COMPILER}" "-E"
                           ${CMAKE_C_FLAGS}
+                          ${PLATFORM_C_FLAGS}
                           "-I${SRCDIR}"
                           "-I${BINDIR}"
                           ${INCLUDES}