dev-libs/libfmt:=
media-libs/glew:0=
media-libs/libepoxy
media-libs/libjpeg-turbo:0=
media-libs/libpng:0=
sys-libs/zlib:=
virtual/glu
virtual/opengl

ffmpeg?
      ( media-video/ffmpeg:0 )

glut?
      ( media-libs/freeglut )

lua?
      ( lua_single_target_luajit?
            ( dev-lang/luajit:= )
       lua_single_target_lua5-1?
            ( dev-lang/lua:5.1 )
       lua_single_target_lua5-3?
            ( dev-lang/lua:5.3 )
       )

qt5?
      ( dev-qt/qtcore:5 dev-qt/qtgui:5 dev-qt/qtopengl:5 dev-qt/qtwidgets:5 )