When sogo (or sope) is emerged on a headless server, several X libraries are pulled in (because the gnustep eclass pulls them in). Examples are: x11-libs/cairo that even requires to set the "X" use flag although X is not installed (and USE="-X" is used). virtual/gnustep-back -gnustep-base/gnustep-back-cairo -gnustep-base/gnustep-back-art -gnustep-base/gnustep-back-xlib It would be great, if this could be changed in the future.