etcprovider.obj : error LNK2019: unresolved external symbol __imp__glBindTexture @8 referenced in function "public: virtual void __thiscall EtcTexture::bind(void )" (?bind@EtcTexture@@UAEXXZ) etcprovider.obj : error LNK2019: unresolved external symbol __imp__glDeleteTextu res@8 referenced in function "public: virtual __thiscall EtcTexture::~EtcTexture (void)" (??1EtcTexture@@UAE@XZ) etcprovider.obj : error LNK2019: unresolved external symbol __imp__glGenTextures @8 referenced in function "public: virtual void __thiscall EtcTexture::bind(void )" (?bind@EtcTexture@@UAEXXZ) etcprovider.obj : error LNK2019: unresolved external symbol __imp__glGetError@0 referenced in function "public: virtual void __thiscall EtcTexture::bind(void)" (?bind@EtcTexture@@UAEXXZ) debug\textureprovider.exe : fatal error LNK1120: 4 unresolved externals NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0 \VC\BIN\link.EXE"' : return code '0x460' Stop. NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0 \VC\BIN\nmake.exe"' : return code '0x2' Stop. NMAKE : fatal error U1077: 'cd' : return code '0x2' Stop. NMAKE : fatal error U1077: 'cd' : return code '0x2' Stop. NMAKE : fatal error U1077: 'cd' : return code '0x2' Stop. NMAKE : fatal error U1077: 'cd' : return code '0x2' Stop.