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diff --git a/var/spack/repos/builtin/packages/libint/package.py b/var/spack/repos/builtin/packages/libint/package.py
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+##############################################################################
+# 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 *
+
+
+class Libint(Package):
+    """Libint is a high-performance library for computing
+    Gaussian integrals in quantum mechanics."""
+
+    homepage = "https://github.com/evaleev/libint"
+    url      = "https://github.com/evaleev/libint/archive/v2.1.0.tar.gz"
+
+    version('2.1.0', 'd0dcb985fe32ddebc78fe571ce37e2d6')
+    version('1.1.6', '990f67b55f49ecc18f32c58da9240684')
+    version('1.1.5', '379b7d0718ff398715d6898807adf628')
+
+    # Build dependencies
+    depends_on('autoconf@2.52:', type='build')
+    depends_on('automake',       type='build')
+    depends_on('libtool',        type='build')
+
+    # Libint 2 dependencies
+    depends_on('boost', when='@2:')
+    depends_on('gmp',   when='@2:')
+
+    def url_for_version(self, version):
+        base_url = "https://github.com/evaleev/libint/archive"
+        if version == Version('1.0.0'):
+            return "{0}/LIBINT_1_00.tar.gz".format(base_url)
+        elif version < Version('2.1.0'):
+            return "{0}/release-{1}.tar.gz".format(base_url, version.dashed)
+        else:
+            return "{0}/v{1}.tar.gz".format(base_url, version)
+
+    def install(self, spec, prefix):
+        # Generate configure
+        libtoolize()
+        aclocal('-I', 'lib/autoconf')
+        autoconf()
+
+        config_args = [
+            '--prefix={0}'.format(prefix)
+        ]
+
+        # Optimizations for the Intel compiler, suggested by CP2K
+        optflags = '-O2'
+        if self.compiler.name == 'intel':
+            optflags += ' -xAVX -axCORE-AVX2 -ipo'
+            if which('xiar'):
+                env['AR'] = 'xiar'
+
+        env['CFLAGS']   = optflags
+        env['CXXFLAGS'] = optflags
+
+        # Optimization flag names have changed in libint 2
+        if self.version < Version('2.0.0'):
+            config_args.extend([
+                '--with-cc-optflags={0}'.format(optflags),
+                '--with-cxx-optflags={0}'.format(optflags)
+            ])
+        else:
+            config_args.extend([
+                '--with-cxx-optflags={0}'.format(optflags),
+                '--with-cxxgen-optflags={0}'.format(optflags)
+            ])
+
+        # Options required by CP2K, removed in libint 2
+        if self.version < Version('2.0.0'):
+            config_args.extend([
+                '--with-libint-max-am=5',
+                '--with-libderiv-max-am1=4'
+            ])
+
+        configure(*config_args)
+        make()
+
+        # Testing suite was added in libint 2
+        if self.version >= Version('2.0.0'):
+            make('check')
+
+        make('install')