Fixed git issue..

src/linker.cpp

@@ -484,9 +484,11 @@ gb_internal i32 linker_stage(LinkerData *gen) {
 			defer (gb_string_free(platform_lib_str));
 			if (build_context.metrics.os == TargetOs_darwin) {
 				platform_lib_str = gb_string_appendc(platform_lib_str, "-lm -Wl,-syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -L/usr/local/lib");
+				#if defined(GB_SYSTEM_OSX)
 				if(gen->needs_system_library_linked) {
 					platform_lib_str = gb_string_appendc(platform_lib_str, "-lSystem");
 				}
+				#endif
 			} else {
 				platform_lib_str = gb_string_appendc(platform_lib_str, "-lc -lm");
 			}