diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4fbc7c8..c4d0974 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -138,9 +138,10 @@ if (CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
 	add_definitions(-fno-strict-aliasing)
 
 	CHECK_CXX_COMPILER_FLAG("-fvisibility=hidden" cxx_has_fvisibility)
-	if (cxx_has_fvisibility)
-		add_definitions(-fvisibility=hidden)
+	if (NOT cxx_has_fvisibility)
+		message(FATAL_ERROR "Compiler does not support -fvisibility")
 	endif()
+	add_definitions(-fvisibility=hidden)
 
 	# TODO fix these warnings
 	add_definitions(-Wno-sign-compare)
diff --git a/d3xp/Game.def b/d3xp/Game.def
deleted file mode 100644
index 4461243..0000000
--- a/d3xp/Game.def
+++ /dev/null
@@ -1,2 +0,0 @@
-EXPORTS
-	GetGameAPI
diff --git a/d3xp/Game_local.cpp b/d3xp/Game_local.cpp
index 077ddb2..cd36bdf 100644
--- a/d3xp/Game_local.cpp
+++ b/d3xp/Game_local.cpp
@@ -134,10 +134,7 @@ static const char* fastEntityList[] = {
 GetGameAPI
 ============
 */
-#if __GNUC__ >= 4
-#pragma GCC visibility push(default)
-#endif
-extern "C" gameExport_t *GetGameAPI( gameImport_t *import ) {
+extern "C" ID_GAME_API gameExport_t *GetGameAPI( gameImport_t *import ) {
 
 	if ( import->version == GAME_API_VERSION ) {
 
@@ -170,9 +167,6 @@ extern "C" gameExport_t *GetGameAPI( gameImport_t *import ) {
 
 	return &gameExport;
 }
-#if __GNUC__ >= 4
-#pragma GCC visibility pop
-#endif
 
 /*
 ===========
diff --git a/game/Game.def b/game/Game.def
deleted file mode 100644
index 38f6f29..0000000
--- a/game/Game.def
+++ /dev/null
@@ -1 +0,0 @@
-EXPORTS	GetGameAPI
diff --git a/game/Game_local.cpp b/game/Game_local.cpp
index 20fddb7..3b99f75 100644
--- a/game/Game_local.cpp
+++ b/game/Game_local.cpp
@@ -98,11 +98,7 @@ const char *idGameLocal::sufaceTypeNames[ MAX_SURFACE_TYPES ] = {
 GetGameAPI
 ============
 */
-#if __GNUC__ >= 4
-#pragma GCC visibility push(default)
-#endif
-extern "C" gameExport_t *GetGameAPI( gameImport_t *import ) {
-
+extern "C" ID_GAME_API gameExport_t *GetGameAPI( gameImport_t *import ) {
 	if ( import->version == GAME_API_VERSION ) {
 
 		// set interface pointers used by the game
@@ -134,9 +130,6 @@ extern "C" gameExport_t *GetGameAPI( gameImport_t *import ) {
 
 	return &gameExport;
 }
-#if __GNUC__ >= 4
-#pragma GCC visibility pop
-#endif
 
 /*
 ===========
diff --git a/sys/platform.h b/sys/platform.h
index 6bab71b..a95a8ba 100644
--- a/sys/platform.h
+++ b/sys/platform.h
@@ -53,12 +53,22 @@ If you have questions concerning this license or the applicable additional terms
 #define PATHSEPERATOR_CHAR			'\\'
 
 #ifdef _MSC_VER
+#ifdef GAME_DLL
+#define ID_GAME_API					__declspec(dllexport)
+#else
+#define ID_GAME_API
+#endif
 #define ALIGN16( x )				__declspec(align(16)) x
 #define PACKED
 #define ID_INLINE					__forceinline
 #define ID_STATIC_TEMPLATE			static
 #define assertmem( x, y )			assert( _CrtIsValidPointer( x, y, true ) )
 #else
+#ifdef GAME_DLL
+#define ID_GAME_API					__attribute__((visibility ("default")))
+#else
+#define ID_GAME_API
+#endif
 #define ALIGN16( x )				x __attribute__ ((aligned (16)))
 #define PACKED						__attribute__((packed))
 #define ID_INLINE					inline
@@ -82,6 +92,12 @@ If you have questions concerning this license or the applicable additional terms
 	#define CPU_EASYARGS			1
 #endif
 
+#ifdef GAME_DLL
+#define ID_GAME_API					__attribute__((visibility ("default")))
+#else
+#define ID_GAME_API
+#endif
+
 #define ALIGN16( x )				x __attribute__ ((aligned (16)))
 
 #define PACKED						__attribute__((packed))
@@ -140,6 +156,12 @@ If you have questions concerning this license or the applicable additional terms
 #define _alloca						alloca
 #define _alloca16( x )				((void *)((((uintptr_t)alloca( (x)+15 )) + 15) & ~15))
 
+#ifdef GAME_DLL
+#define ID_GAME_API					__attribute__((visibility ("default")))
+#else
+#define ID_GAME_API
+#endif
+
 #define ALIGN16( x )				x
 #define PACKED						__attribute__((packed))