Revert gl.h emulation using __gl_h_ include guard
Revert gl.h emulation using __gl_h_ include guard
j-o/glbinding,mcleary/glbinding,hpicgs/glbinding,mcleary/glbinding,j-o/glbinding,hpicgs/glbinding,mcleary/glbinding,mcleary/glbinding,j-o/glbinding,hpicgs/glbinding,cginternals/glbinding,cginternals/glbinding,hpicgs/glbinding,j-o/glbinding