From f213b000220702d4debd878d27d5e7f0206b75d2 Mon Sep 17 00:00:00 2001
From: Erwin Coumans <erwin.coumans@gmail.com>
Date: Mon, 19 May 2014 20:50:10 -0700
Subject: [PATCH] fix BUILD_SHARED_LIBS and add it as an OPTION (cross fingers
 that CMake lets you expose existing vars as OPTION) this should fix issue
 176, thanks to Stephen Peters!

---
 CMakeLists.txt                    | 6 +++++-
 btgui/OpenGLWindow/CMakeLists.txt | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e0f659182..2d9b5a4e5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@ SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -D_DEBUG")
 
 OPTION(USE_DOUBLE_PRECISION "Use double precision"	OFF)
 OPTION(USE_GRAPHICAL_BENCHMARK "Use Graphical Benchmark" ON)
-
+OPTION(BUILD_SHARED_LIBS "Use shared libraries" OFF)
 
 OPTION(USE_MSVC_RUNTIME_LIBRARY_DLL "Use MSVC Runtime Library DLL (/MD or /MDd)" OFF)
 OPTION(USE_MSVC_INCREMENTAL_LINKING "Use MSVC Incremental Linking" OFF)
@@ -226,6 +226,10 @@ ENDIF(USE_GLUT)
 	ENDIF()
 ENDIF(BUILD_BULLET2_DEMOS)
 
+IF (APPLE)
+  FIND_LIBRARY(COCOA_LIBRARY Cocoa)
+ENDIF()
+
 OPTION(BUILD_BULLET3 "Set when you want to build Bullet 3" ON)
 IF(BUILD_BULLET3)
 	OPTION(BUILD_BULLET3_DEMOS "Set when you want to build the Bullet 3 demos" ON)
diff --git a/btgui/OpenGLWindow/CMakeLists.txt b/btgui/OpenGLWindow/CMakeLists.txt
index 81e9bcf3e..4af098ac0 100644
--- a/btgui/OpenGLWindow/CMakeLists.txt
+++ b/btgui/OpenGLWindow/CMakeLists.txt
@@ -40,6 +40,8 @@ ENDIF()
 ADD_LIBRARY(OpenGLWindow ${OpenGLWindow_SRCS} ${OpenGLWindow_HDRS})
 if (UNIX AND NOT APPLE)
   target_link_libraries(OpenGLWindow X11)
+elseif (APPLE)
+  target_link_libraries(OpenGLWindow ${COCOA_LIBRARY})
 endif ()
 
 if (BUILD_SHARED_LIBS)