Print extension headers
copied from cf-staging / xorg-xf86dgaprotoconda install conda-forge::xorg-xf86dgaproto
conda install conda-forge/label/cf201901::xorg-xf86dgaproto
conda install conda-forge/label/cf202003::xorg-xf86dgaproto
conda install conda-forge/label/gcc7::xorg-xf86dgaproto