build failed on gentoo x64

g++ -pipe -DNV_CUBE_MAP -O3 -g -pthread -o base_maker objconv/basemaker/base_maker.o objconv/basemaker/base_maker_texture.o src/xml_support.o -lvorbisfile -lvorbis -logg -lGL -lGLU -lXmu -lXi -lglut -lexpat -lpng -ljpeg -lopenal -lvorbisfile -lvorbis -logg -L/usr/lib -lpython2.6 -Xlinker -export-dynamic -pthread
objconv/basemaker/base_maker.o: In function `Base::Room::BaseVSSprite::EndXML(_IO_FILE*)':
/home/kilo/data/src/VegaStrike/vegastrike/objconv/basemaker/base_maker.cpp:1000: undefined reference to `VSSprite::GetPosition(float&, float&)'
objconv/basemaker/base_maker.o: In function `BaseVSSprite':
/home/kilo/data/src/VegaStrike/vegastrike/objconv/basemaker/base_maker.cpp:731: undefined reference to `VSSprite::VSSprite(char const*, FILTER, unsigned char)'
objconv/basemaker/base_maker.o: In mv -f objconv/mesher/Modules/.deps/mesher-XMesh_to_BFXM.Tpo objconv/mesher/Modules/.deps/mesher-XMesh_to_BFXM.Po
function `AddRoomSprite(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned int, void*, void*, void const*, float, float)':
/home/kilo/data/src/VegaStrike/vegastrike/objconv/basemaker/base_maker.cpp:1394: undefined reference to `VSSprite::SetPosition(float const&, float const&)'
objconv/basemaker/base_maker.o: In function `Base::Room::BaseVSSprite::Draw(Base*)':
/home/kilo/data/src/VegaStrike/vegastrike/objconv/basemaker/base_maker.cpp:1419: undefined reference to `VSSprite::Draw()'
objconv/basemaker/base_maker.o: In function `~BaseVSSprite':
/home/kilo/data/src/VegaStrike/vegastrike/objconv/basemaker/base_maker.cpp:728: undefined reference to `VSSprite::~VSSprite()'
/home/kilo/data/src/VegaStrike/vegastrike/objconv/basemaker/base_maker.cpp:728: undefined reference to `VSSprite::~VSSprite()'