X11-extras-0.0: README

If you are building from a source tarball, you can just use the standard cabal
installation stanza:

$ runghc Setup config
$ runghc Setup build
$ runghc Setup install

However, if you are building from darcs, X11-extras uses autoconf, so you need
to have autoconf installed and run autoconf/autoheader before building:

$ autoconf
$ autoheader