Mine

moduleset = 'http://gitweb.freedesktop.org/?p=xorg/util/modular.git;a=blob_plain;f=xorg.modules'
modules = [ 'xorg' ]
checkoutroot = os.path.expanduser('~/git')
prefix = os.path.expanduser('~/xorg')

autogenargs = ''
autogenargs = autogenargs + ' --disable-static'
autogenargs = autogenargs + ' --cache-file=' + checkoutroot + '/autoconf-cache'
# FreeBSD's expat is in /usr/local/
#autogenargs = autogenargs + ' --with-expat=/usr/local'
# lots of people really like to always look in /var/log, but change if
# you want the log files out of place
autogenargs = autogenargs + ' --with-log-dir=/var/log'
autogenargs = autogenargs + ' --with-mesa-source=' + checkoutroot + '/mesa'

os.environ['ACLOCAL'] = 'aclocal -I ' + prefix + '/share/aclocal/'
os.environ['INSTALL'] = os.path.expanduser('~/bin/install-check')