diff --git a/sourcemm/ISmmPlugin.h b/sourcemm/ISmmPlugin.h
index ac59685..b54f7be 100644
--- a/sourcemm/ISmmPlugin.h
+++ b/sourcemm/ISmmPlugin.h
@@ -240,7 +240,11 @@ public:
 #if defined __WIN32__ || defined _WIN32 || defined WIN32
 	#define SMM_API extern "C" __declspec(dllexport)
 #elif defined __GNUC__
-	#define SMM_API	extern "C"
+	#if (__GNUC__ == 4) && (__GNUC_MINOR__ >= 1)
+		#define SMM_API extern "C" __attribute__ ((visibility("default")))	
+	#else
+		#define SMM_API	extern "C" 
+	#endif	
 #endif
 #endif //!defined SMM_API
 
diff --git a/sourcemm/Makefile b/sourcemm/Makefile
index fc2a952..e5af1a3 100644
--- a/sourcemm/Makefile
+++ b/sourcemm/Makefile
@@ -7,9 +7,9 @@ SRCDS = ~/srcds
 
 ### EDIT BELOW FOR OTHER PROJECTS ###
 
-OPT_FLAGS = -O2 -funroll-loops -s -pipe
+OPT_FLAGS = -O2 -funroll-loops -s -pipe -fvisibility=hidden
 DEBUG_FLAGS = -g -ggdb3
-CPP = gcc-3.4
+CPP = gcc-4.1
 BINARY = server_i486.so
 
 OBJECTS = oslink.cpp util.cpp convar.cpp concommands.cpp \
@@ -60,4 +60,4 @@ clean:
 	rm -rf Release/$(BINARY)
 	rm -rf Debug/*.o
 	rm -rf Debug/$(BINARY)
-	
\ No newline at end of file
+	
diff --git a/sourcemm/oslink.h b/sourcemm/oslink.h
index 03d7af5..1b655fc 100644
--- a/sourcemm/oslink.h
+++ b/sourcemm/oslink.h
@@ -61,7 +61,11 @@ bool GetFileOfAddress(void *pAddr, char *buffer, size_t maxlength);
 #if defined __WIN32__ || defined _WIN32 || defined WIN32
 	#define SMM_API extern "C" __declspec(dllexport)
 #elif defined __GNUC__
-	#define SMM_API	extern "C"
+	#if (__GNUC__ == 4) && (__GNUC_MINOR__ >= 1)
+		#define SMM_API extern "C" __attribute__ ((visibility("default")))	
+	#else
+		#define SMM_API	extern "C" 
+	#endif	
 #endif
 
 #if defined __WIN32__ || defined _WIN32 || defined WIN32