anchor.diff:  , xf86vidmodeproto
   , xorg
   , xproto
  +
  +, glesSupport ? false
   }:
   
   let
  
positive.code: , lib
  , ninja
  
  , inputproto
  , libx11
  , libxrandr
  
negative.code: 
    cmakeFlags = [
      "-DFREEGLUT_BUILD_DEMOS=OFF"
      # XXX: Cannot build both libglut and libfreeglut-gles.
      "-DFREEGLUT_GLES=${boolOn (
        glesSupport
        && opengl-dummy.egl
        && opengl-dummy.glesv1
        && opengl-dummy.glesv2)}"
    ];
  