I don't think that /usr/gr is the right place to install a package list of files, fonts omitted /usr/gr /usr/gr/bin /usr/gr/bin/gksqt /usr/gr/fonts /usr/gr/include /usr/gr/include/gks.h /usr/gr/include/gr.h /usr/gr/include/gr3.h /usr/gr/include/grm /usr/gr/include/grm.h /usr/gr/include/grm/args.h /usr/gr/include/grm/dump.h /usr/gr/include/grm/event.h /usr/gr/include/grm/interaction.h /usr/gr/include/grm/net.h /usr/gr/include/grm/plot.h /usr/gr/include/grm/util.h /usr/gr/include/grwidget.h /usr/gr/lib64 /usr/gr/lib64/cairoplugin.so /usr/gr/lib64/cmake /usr/gr/lib64/cmake/GR /usr/gr/lib64/cmake/GR/GRConfig.cmake /usr/gr/lib64/cmake/GR/GRConfigVersion.cmake /usr/gr/lib64/cmake/GR/GRTargets-gentoo.cmake /usr/gr/lib64/cmake/GR/GRTargets.cmake /usr/gr/lib64/glplugin.so /usr/gr/lib64/gsplugin.so /usr/gr/lib64/gtkplugin.so /usr/gr/lib64/libGKS.so /usr/gr/lib64/libGR.so /usr/gr/lib64/libGR3.so /usr/gr/lib64/libGR3platform.so /usr/gr/lib64/libGRM.so /usr/gr/lib64/libqt5gr.so /usr/gr/lib64/pgfplugin.so /usr/gr/lib64/pkgconfig /usr/gr/lib64/pkgconfig/gks.pc /usr/gr/lib64/pkgconfig/gr.pc /usr/gr/lib64/pkgconfig/gr3.pc /usr/gr/lib64/pkgconfig/grm.pc /usr/gr/lib64/qt5plugin.so /usr/gr/lib64/qtplugin.so /usr/gr/lib64/svgplugin.so /usr/gr/lib64/videoplugin.so /usr/gr/lib64/wmfplugin.so /usr/gr/lib64/x11plugin.so /usr/gr/lib64/zmqplugin.so
tinderbox has reproduced this issue with version 0.53.0 - Updating summary.
reproduced
ci has reproduced this issue with version 0.53.0-r1 - Updating summary.
See the comments in the ebuild for the reason. In short, there's nothing we can do about it.