[[ "$(eselect opengl show)" == 'nvidia' ]] \ && myconf='--enable-nvidia=yes' \ || myconf='--enable-nvidia=no' This is unacceptable as it: 1) makes binary packages rely on build-system configuration, 2) makes the installed application rely on build-time configuration implicitly. Depending on what '--enable-nvidia' does, it should either be enabled unconditionally or use video_cards_nvidia.
Fixed. Thanks for report