diff --git a/cl_dll/cl_util.h b/cl_dll/cl_util.h
index f619204..e2cf760 100644
--- a/cl_dll/cl_util.h
+++ b/cl_dll/cl_util.h
@@ -17,9 +17,8 @@
 //
 
 #include "cvardef.h"
-
-#define EXPORT	_declspec( dllexport )
-#define DLLEXPORT	__declspec( dllexport )
+#include "port.h"
+#include "exportdef.h"
 
 #ifndef TRUE
 #define TRUE 1
@@ -135,14 +134,14 @@ extern "C" void DLLEXPORT HUD_StudioEvent( const struct mstudioevent_s *event, c
 
 #define DECLARE_MESSAGE(y, x) int __MsgFunc_##x(const char *pszName, int iSize, void *pbuf) \
 							{ \
-							return gHUD.##y.MsgFunc_##x(pszName, iSize, pbuf ); \
+							return gHUD.y.MsgFunc_##x(pszName, iSize, pbuf ); \
 							}
 
 
 #define HOOK_COMMAND(x, y) gEngfuncs.pfnAddCommand( x, __CmdFunc_##y );
 #define DECLARE_COMMAND(y, x) void __CmdFunc_##x( void ) \
 							{ \
-								gHUD.##y.UserCmd_##x( ); \
+								gHUD.y.UserCmd_##x( ); \
 							}
 
 #define SPR_Set (*gEngfuncs.pfnSPR_Set)
diff --git a/common/port.h b/common/port.h
index 33b4e2d..6b9a351 100644
--- a/common/port.h
+++ b/common/port.h
@@ -87,6 +87,7 @@ GNU General Public License for more details.
 	typedef unsigned int   ULONG;
 	typedef int			WPARAM;
 	typedef unsigned int    LPARAM;
+	typedef int		BOOL;
 
 	typedef void* HANDLE;
 	typedef void* HMODULE;
diff --git a/dlls/exportdef.h b/dlls/exportdef.h
new file mode 100644
index 0000000..363d8d1
--- /dev/null
+++ b/dlls/exportdef.h
@@ -0,0 +1,19 @@
+#pragma once
+#ifndef EXPORTDEF_H
+#define EXPORTDEF_H
+#if defined _WIN32 || defined __CYGWIN__
+	#ifdef __GNUC__
+		#define EXPORT __attribute__ ((dllexport))
+	#else
+		#define EXPORT __declspec(dllexport) // Note: actually gcc seems to also supports this syntax.
+	#endif
+#else
+	#if __GNUC__ >= 4
+		#define EXPORT __attribute__ ((visibility ("default")))
+	#else
+		#define EXPORT
+	#endif
+#endif
+#define DLLEXPORT EXPORT
+#define _DLLEXPORT EXPORT
+#endif // EXPORTDEF_H