From 1145bed3203ed0e489369801b0b1ac13e783d183 Mon Sep 17 00:00:00 2001
From: Martin Paljak <martin@martinpaljak.net>
Date: Sat, 25 Oct 2014 20:01:38 +0300
Subject: [PATCH] macosx: locate the best newest SDK present on the computer.

With recent versions of XCode, PC/SC headers are hidden inside
the SDK folder inside XCode app, and the global path is not
guaranteed to be present. This allows to build easily from source
without depending on a specific XCode/OSX version.
---
 configure.ac | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index df62bb00..b2853ae3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -530,7 +530,11 @@ if test "${enable_pcsc}" = "yes"; then
 		if test -z "${PCSC_CFLAGS}"; then
 			case "${host}" in
 				*-*-darwin*)
-					PCSC_CFLAGS="-I/System/Library/Frameworks/PCSC.framework/Headers"
+					# Locate the latest SDK.
+					SDKS_PATH="$(xcode-select -p)/Platforms/MacOSX.platform/Developer/SDKs"
+					SDK_PATH="${SDK_PATH:-$SDKS_PATH/$(ls -1 ${SDKS_PATH} | sort -n -t. -k2 -r | head -1)}"
+					# and set the PC/SC include path
+					PCSC_CFLAGS="-I$SDK_PATH/System/Library/Frameworks/PCSC.framework/Versions/Current/Headers"
 				;;
 				*)
 					PCSC_CFLAGS="-I/usr/include/PCSC"