Allow serial loads from implementation libraries.

engine/engine.xcodeproj/project.pbxproj

@@ -15,7 +15,7 @@
 		CD62FCD622904A9B00376440 /* GoogleMock.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = CD62FCBE22904A7C00376440 /* GoogleMock.framework */; };
 		CD62FD35229364DB00376440 /* entity.cxx in Sources */ = {isa = PBXBuildFile; fileRef = CD62FD33229364DB00376440 /* entity.cxx */; };
 		CD62FD3C229370E200376440 /* libjsoncpp.1.8.4.dylib in Frameworks */ = {isa = PBXBuildFile; fileRef = CD62FD3922936E9C00376440 /* libjsoncpp.1.8.4.dylib */; };
-		CD62FD402293746900376440 /* serial.cxx in Sources */ = {isa = PBXBuildFile; fileRef = CD62FD3E2293746900376440 /* serial.cxx */; };
+		CD62FD402293746900376440 /* serial.cxx in Sources */ = {isa = PBXBuildFile; fileRef = CD62FD3E2293746900376440 /* serial.cxx */; settings = {COMPILER_FLAGS = "-fvisibility=default"; }; };
 		CD7E87792295FAB400D877FE /* libgameutils.dylib in Frameworks */ = {isa = PBXBuildFile; fileRef = CD7E87782295FAB400D877FE /* libgameutils.dylib */; };
 		CDB1F8C81D7A312B00700C6B /* game_dispatch.cpp in Sources */ = {isa = PBXBuildFile; fileRef = CDB1F8C61D7A312B00700C6B /* game_dispatch.cpp */; settings = {COMPILER_FLAGS = "-fvisibility=default"; }; };
 		CDB1F8CC1D7A319A00700C6B /* scene.cpp in Sources */ = {isa = PBXBuildFile; fileRef = CDB1F8CA1D7A319A00700C6B /* scene.cpp */; };