anchor.diff:                               libcurl \
                                xdpyinfo \
                                xrandr \
  -                             ${@base_contains('DISTRO_FEATURES', 'opengl', 'mesa-demos', '', d)} \
  +                             ${@base_contains('PACKAGECONFIG', 'opengl', 'mesa-demos', '', d)} \
   "
   RRECOMMENDS_${PN}_append_libc-glibc = " glibc-charmap-ibm850 \
                                           glibc-gconv-ibm850 \
  
positive.code:     ac_cv_path_PYTHON="${STAGING_BINDIR_NATIVE}/python-native/python" \
  "
  
  PACKAGECONFIG ??= "vaapi vdpau ${@base_contains('DISTRO_FEATURES', 'opengl', 'opengl', 'openglesv2', d)}"
  PACKAGECONFIG[opengl] = "--enable-gl,--enable-gles,glew"
  PACKAGECONFIG[openglesv2] = "--enable-gles,--enable-gl,"
  PACKAGECONFIG[vaapi] = "--enable-vaapi,--disable-vaapi,libva"
  
negative.code: 
  FULL_OPTIMIZATION_armv7a = "-fexpensive-optimizations -fomit-frame-pointer -O4 -ffast-math"
  BUILD_OPTIMIZATION = "${FULL_OPTIMIZATION}"
  
  # for python modules
  export HOST_SYS
  