Print extension headers
copied from cf-staging / xorg-xineramaprotoconda install conda-forge::xorg-xineramaproto
conda install conda-forge/label/cf201901::xorg-xineramaproto
conda install conda-forge/label/cf202003::xorg-xineramaproto
conda install conda-forge/label/gcc7::xorg-xineramaproto