anchor.diff:      "--sysconfdir=/etc"
       "--localstatedir=/var"
       "--enable-largefile"
  -    "--disable-pwr8-inst"  # power
       # slight performance degradation, enable only for grsec
       "--${boolEn grsecEnabled}-glx-rts"
       "--disable-debug"
       "--disable-profile"
       "--${boolEn (libglvnd != null)}-libglvnd"
       "--disable-mangling"
  +    "--disable-libunwind"
       "--${boolEn enableTextureFloats}-texture-float"
       "--enable-asm"
       # TODO: selinux support
  
positive.code: , lm-sensors
  , wayland
  , xorg
  
  , grsecEnabled
  # Texture floats are patented, see docs/patents.txt
  
negative.code:     #"--with-vulkan-icddir=DIR"
      #osmesa-bits=8
      #"--with-clang-libdir=${llvm}/lib"
      "--with-platforms=x11,wayland,drm"
      #llvm-prefix
      #xvmc-libdir
      #vdpau-libdir
  