To build this package using Cabal directly from Git, you must run
autoreconf before the usual Cabal build steps (configure/build/install).
autoreconf is included in the GNU autoconf tools. There is no need to run
the configure script: the cabal configure step will do this for you.
If you are building from a source tarball, you can just use the standard Cabal installation stanza:
cabal configure
cabal build
cabal install
Xinerama support is enabled by default if Xinerama headers are detected. To
disable Xinerama support, add the --without-xinerama flag to
configure-option:
cabal configure --configure-option="--without-xinerama"
However, if you are building from Git, X11 uses autoconf, so you need
to have autoconf installed and run autoconf/autoheader before building:
autoconf
autoheader
or
autoreconf