/usr/include/libpng12/png.h:2659:31: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix]
/usr/include/libpng12/png.h:2667:31: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix]
/usr/include/libpng12/png.h:2675:31: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix]