diff --git a/Demos3/AllBullet2Demos/CMakeLists.txt b/Demos3/AllBullet2Demos/CMakeLists.txt
index 29cfb6d24..04e995302 100644
--- a/Demos3/AllBullet2Demos/CMakeLists.txt
+++ b/Demos3/AllBullet2Demos/CMakeLists.txt
@@ -41,9 +41,13 @@ IF (WIN32)
 	)
 	ADD_DEFINITIONS(-DGLEW_STATIC)
 ELSE(WIN32)
-	IF(NOT APPLE)
+	IF(APPLE)
+                find_library(COCOA NAMES Cocoa)
+                MESSAGE(${COCOA})
+                link_libraries(${COCOA})
+        ELSE(APPLE)
 		LINK_LIBRARIES( GLEW)
-	ENDIF(NOT APPLE)
+	ENDIF(APPLE)
 ENDIF(WIN32)
  
 	
@@ -61,4 +65,4 @@ IF (INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
 			SET_TARGET_PROPERTIES(App_AllBullet2Demos PROPERTIES  DEBUG_POSTFIX "_Debug")
 			SET_TARGET_PROPERTIES(App_AllBullet2Demos PROPERTIES  MINSIZEREL_POSTFIX "_MinsizeRel")
 			SET_TARGET_PROPERTIES(App_AllBullet2Demos PROPERTIES  RELWITHDEBINFO_POSTFIX "_RelWithDebugInfo")
-ENDIF(INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
\ No newline at end of file
+ENDIF(INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
diff --git a/Demos3/GpuDemos/CMakeLists.txt b/Demos3/GpuDemos/CMakeLists.txt
index 74bbe45c2..06dc4e81a 100644
--- a/Demos3/GpuDemos/CMakeLists.txt
+++ b/Demos3/GpuDemos/CMakeLists.txt
@@ -45,9 +45,13 @@ IF (WIN32)
 	)
 	ADD_DEFINITIONS(-DGLEW_STATIC)
 ELSE(WIN32)
-	IF(NOT APPLE)
+	IF(APPLE)
+                find_library(COCOA NAMES Cocoa)
+                MESSAGE(${COCOA})
+                link_libraries(${COCOA})
+        ELSE(APPLE)
 		LINK_LIBRARIES( GLEW X11 dl)
-	ENDIF(NOT APPLE)
+	ENDIF(APPLE)
 ENDIF(WIN32)
 
 
@@ -60,4 +64,4 @@ IF (INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
 			SET_TARGET_PROPERTIES(App_Bullet3_OpenCL_Demos PROPERTIES  DEBUG_POSTFIX "_Debug")
 			SET_TARGET_PROPERTIES(App_Bullet3_OpenCL_Demos PROPERTIES  MINSIZEREL_POSTFIX "_MinsizeRel")
 			SET_TARGET_PROPERTIES(App_Bullet3_OpenCL_Demos PROPERTIES  RELWITHDEBINFO_POSTFIX "_RelWithDebugInfo")
-ENDIF(INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
\ No newline at end of file
+ENDIF(INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
diff --git a/Demos3/SimpleOpenGL3/CMakeLists.txt b/Demos3/SimpleOpenGL3/CMakeLists.txt
index 1181dd8e2..7cae8b701 100644
--- a/Demos3/SimpleOpenGL3/CMakeLists.txt
+++ b/Demos3/SimpleOpenGL3/CMakeLists.txt
@@ -22,9 +22,13 @@ IF (WIN32)
 	)
 	ADD_DEFINITIONS(-DGLEW_STATIC)
 ELSE(WIN32)
-	IF(NOT APPLE)
+	IF(APPLE)
+		find_library(COCOA NAMES Cocoa)
+		MESSAGE(${COCOA})
+		link_libraries(${COCOA})
+	ELSE(APPLE)
 		LINK_LIBRARIES( GLEW X11 dl Xext)
-	ENDIF(NOT APPLE)
+	ENDIF(APPLE)
 ENDIF(WIN32)
 
 
@@ -37,4 +41,4 @@ IF (INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
 			SET_TARGET_PROPERTIES(AppSimpleOpenGL3 PROPERTIES  DEBUG_POSTFIX "_Debug")
 			SET_TARGET_PROPERTIES(AppSimpleOpenGL3 PROPERTIES  MINSIZEREL_POSTFIX "_MinsizeRel")
 			SET_TARGET_PROPERTIES(AppSimpleOpenGL3 PROPERTIES  RELWITHDEBINFO_POSTFIX "_RelWithDebugInfo")
-ENDIF(INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
\ No newline at end of file
+ENDIF(INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
diff --git a/build3/premake4.lua b/build3/premake4.lua
index 00c770f62..a5c308db5 100644
--- a/build3/premake4.lua
+++ b/build3/premake4.lua
@@ -32,7 +32,12 @@
 		trigger = "enet",
 		description = "Enable enet NAT punchthrough test"
 	}
-  
+ 
+	newoption
+	{
+		trigger = "gtest",
+		description = "Enable unit tests using gtest"
+	} 
 	configurations {"Release", "Debug"}
 	configuration "Release"
 		flags { "Optimize", "EnableSSE2","StaticRuntime", "NoMinimalRebuild", "FloatFast"}
@@ -88,11 +93,13 @@
 	dofile ("findOpenGLGlewGlut.lua")
 	
 	language "C++"
+
+	if _OPTIONS["gtest"] then	
+		include "../test/gtest-1.7.0"
+--		include "../test/hello_gtest"
 	
-	include "../test/gtest-1.7.0"
---	include "../test/hello_gtest"
-	
-	include "../test/TestBullet3OpenCL"
+		include "../test/TestBullet3OpenCL"
+	end
 	
 	
 	include "../Demos3/AllBullet2Demos"
diff --git a/src/Bullet3Common/b3Vector3.cpp b/src/Bullet3Common/b3Vector3.cpp
index 5da6a18ca..e43f13897 100644
--- a/src/Bullet3Common/b3Vector3.cpp
+++ b/src/Bullet3Common/b3Vector3.cpp
@@ -42,7 +42,7 @@ long b3_maxdot_large( const float *vv, const float *vec, unsigned long count, fl
 long b3_maxdot_large( const float *vv, const float *vec, unsigned long count, float *dotResult )
 {
     const float4 *vertices = (const float4*) vv;
-    static const unsigned char indexTable[16] = {-1, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 };
+    static const unsigned char indexTable[16] = {(unsigned char)-1, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 };
     float4 dotMax = b3Assign128( -B3_INFINITY,  -B3_INFINITY,  -B3_INFINITY,  -B3_INFINITY );
     float4 vvec = _mm_loadu_ps( vec );
     float4 vHi = b3CastiTo128f(_mm_shuffle_epi32( b3CastfTo128i( vvec), 0xaa ));          /// zzzz
@@ -427,7 +427,8 @@ long b3_mindot_large( const float *vv, const float *vec, unsigned long count, fl
 long b3_mindot_large( const float *vv, const float *vec, unsigned long count, float *dotResult )
 {
     const float4 *vertices = (const float4*) vv;
-    static const unsigned char indexTable[16] = {-1, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 };
+    static const unsigned char indexTable[16] = {(unsigned char)-1, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 };
+
     float4 dotmin = b3Assign128( B3_INFINITY,  B3_INFINITY,  B3_INFINITY,  B3_INFINITY );
     float4 vvec = _mm_loadu_ps( vec );
     float4 vHi = b3CastiTo128f(_mm_shuffle_epi32( b3CastfTo128i( vvec), 0xaa ));          /// zzzz
diff --git a/test/TestBullet3OpenCL/main.cpp b/test/TestBullet3OpenCL/main.cpp
index 4a18ce702..aee2434c2 100644
--- a/test/TestBullet3OpenCL/main.cpp
+++ b/test/TestBullet3OpenCL/main.cpp
@@ -6,7 +6,7 @@
 
 void myerrorprintf(const char* msg)
 {
-	printf(msg);
+	printf("%s",msg);
 }
 	
 static bool sVerboseWarning = true;
@@ -16,7 +16,7 @@ void mywarningprintf(const char* msg)
 	if (sVerboseWarning)
 	{
 		//OutputDebugStringA(msg);
-		printf(msg);
+		printf("%s",msg);
 	}
 }
 
@@ -27,7 +27,7 @@ void myprintf(const char* msg)
 	if (sVerbosePrintf)
 	{
 		//OutputDebugStringA(msg);
-		printf(msg);
+		printf("%s",msg);
 	}
 }