celestia

USE flags

• cairo - Enable support for the cairo graphics library
• debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
• glut - Build an OpenGL plugin using the GLUT library
• gnome - Add GNOME support
• gtk - Add support for x11-libs/gtk+ (The GIMP Toolkit)
• nls - Add Native Language Support (using gettext - GNU locale utilities)
• pch - Enable precompiled header support for faster compilation at the expense of disk space and memory (>=sys-devel/gcc-3.4 only)
• qt5 - Add support for the Qt 5 application and UI framework
• theora - Add support for the Theora Video Compression Codec
• threads - Add threads support for various packages. Usually pthreads