RPi Error

[ 25%] Building CXX object external/SFML/clone/src/SFML/Graphics/CMakeFiles/sfml-graphics.dir/RenderTarget.cpp.o
In file included from /home/pi/gqp/SFML/include/SFML/Graphics/Export.hpp:31:0,
                 from /home/pi/gqp/SFML/include/SFML/Graphics/RenderTarget.hpp:31,
                 from /home/pi/gqp/SFML/src/SFML/Graphics/RenderTarget.cpp:28:
/home/pi/gqp/SFML/include/SFML/Config.hpp:185:9: warning: ISO C++ 1998 does not support ‘long long’ [-Wlong-long]
/home/pi/gqp/SFML/include/SFML/Config.hpp:186:9: warning: ISO C++ 1998 does not support ‘long long’ [-Wlong-long]
/home/pi/gqp/SFML/src/SFML/Graphics/RenderTarget.cpp: In function ‘sf::Uint32 {anonymous}::equationToGlConstant(sf::BlendMode::Equation)’:
/home/pi/gqp/SFML/src/SFML/Graphics/RenderTarget.cpp:66:57: error: ‘GL_FUNC_ADD’ was not declared in this scope
/home/pi/gqp/SFML/src/SFML/Graphics/RenderTarget.cpp:67:57: error: ‘GL_FUNC_SUBTRACT’ was not declared in this scope
/home/pi/gqp/SFML/src/SFML/Graphics/RenderTarget.cpp: In member function ‘void sf::RenderTarget::applyBlendMode(const sf::BlendMode&)’:
/home/pi/gqp/SFML/src/SFML/Graphics/RenderTarget.cpp:431:9: error: ‘glBlendEquation’ was not declared in this scope
/home/pi/gqp/SFML/src/SFML/Graphics/RenderTarget.cpp: In function ‘sf::Uint32 {anonymous}::equationToGlConstant(sf::BlendMode::Equation)’:
/home/pi/gqp/SFML/src/SFML/Graphics/RenderTarget.cpp:69:5: warning: control reaches end of non-void function [-Wreturn-type]
make[2]: *** [external/SFML/clone/src/SFML/Graphics/CMakeFiles/sfml-graphics.dir/RenderTarget.cpp.o] Error 1
make[1]: *** [external/SFML/clone/src/SFML/Graphics/CMakeFiles/sfml-graphics.dir/all] Error 2
make: *** [all] Error 2