##############################################################################
# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
# Produced at the Lawrence Livermore National Laboratory.
#
# This file is part of Spack.
# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
# LLNL-CODE-647188
#
# For details, see https://github.com/llnl/spack
# Please also see the LICENSE file for our notice and the LGPL.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License (as
# published by the Free Software Foundation) version 2.1, February 1999.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
# conditions of the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##############################################################################
from spack import *
import os


class Libxml2(Package):
    """Libxml2 is the XML C parser and toolkit developed for the Gnome
       project (but usable outside of the Gnome platform), it is free
       software available under the MIT License."""
    homepage = "http://xmlsoft.org"
    url      = "http://xmlsoft.org/sources/libxml2-2.9.2.tar.gz"

    version('2.9.2', '9e6a9aca9d155737868b3dc5fd82f788')

    variant('python', default=False, description='Enable Python support')

    extends('python', when='+python', ignore=r'(bin.*$)|(include.*$)|(share.*$)|(lib/libxml2.*$)|(lib/xml2.*$)|(lib/cmake.*$)')
    depends_on('zlib')
    depends_on('xz')

    def install(self, spec, prefix):
        if '+python' in spec:
            site_packages_dir = os.path.join(prefix,
                                             'lib/python%s/site-packages' %
                                             (spec['python'].version.up_to(2)))
            python_args = ["--with-python=%s" % spec['python'].prefix,
                           "--with-python-install-dir=%s" % site_packages_dir]
        else:
            python_args = ["--without-python"]

        configure("--prefix=%s" % prefix,
                  *python_args)

        make()
        make("install")

##############################################################################
# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
# Produced at the Lawrence Livermore National Laboratory.
#
# This file is part of Spack.
# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
# LLNL-CODE-647188
#
# For details, see https://github.com/llnl/spack
# Please also see the LICENSE file for our notice and the LGPL.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License (as
# published by the Free Software Foundation) version 2.1, February 1999.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
# conditions of the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##############################################################################
from spack import *
import os


class Libxml2(Package):
    """Libxml2 is the XML C parser and toolkit developed for the Gnome
       project (but usable outside of the Gnome platform), it is free
       software available under the MIT License."""
    homepage = "http://xmlsoft.org"
    url      = "http://xmlsoft.org/sources/libxml2-2.9.2.tar.gz"

    version('2.9.2', '9e6a9aca9d155737868b3dc5fd82f788')

    variant('python', default=False, description='Enable Python support')

    extends('python', when='+python', ignore=r'(bin.*$)|(include.*$)|(share.*$)|(lib/libxml2.*$)|(lib/xml2.*$)|(lib/cmake.*$)')
    depends_on('zlib')
    depends_on('xz')

    def install(self, spec, prefix):
        if '+python' in spec:
            python_args = ["--with-python=%s" % spec['python'].prefix,
                           "--with-python-install-dir=%s" % site_packages_dir]
        else:
            python_args = ["--without-python"]

        configure("--prefix=%s" % prefix,
                  *python_args)

        make()
        make("install")

Use the site_packages_dir from the Python class