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diff --git a/var/spack/repos/builtin/packages/axl/package.py b/var/spack/repos/builtin/packages/axl/package.py
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+++ b/var/spack/repos/builtin/packages/axl/package.py
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+##############################################################################
+# Copyright (c) 2013-2018, 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/spack/spack
+# Please also see the NOTICE and LICENSE files 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 *
+from spack.error import SpackError
+
+
+def async_api_validator(values):
+    if 'none' in values and len(values) != 1:
+        raise SpackError("The value 'none' is not usable"
+                         " with other async_api values.")
+    if 'ibm_bbapi' in values and 'cray_dw' in values:
+        raise SpackError("The 'ibm_bbapi' and 'cray_dw' asynchronous"
+                         " APIs are incompatible.")
+
+
+class Axl(CMakePackage):
+    """Asynchronous transfer library"""
+
+    homepage = "https://github.com/ECP-VeloC/AXL"
+    url      = "https://github.com/ECP-VeloC/AXL/archive/v0.1.0.zip"
+    tags     = ['ecp']
+
+    version('0.1.0', '1ff16c046c3a080c252e0bf4251b83bc')
+    version('master', git='https://github.com/ecp-veloc/axl.git',
+            branch='master')
+
+    variant('async_api', default='daemon',
+            description="Set of async transfer APIs to enable",
+            values=['cray_dw', 'ibm_bbapi', 'daemon', 'none'], multi=True,
+            validator=async_api_validator)
+
+    # not-yet implemented functionality
+    conflicts('async_api=cray_dw', when='@0.1.0')
+    conflicts('async_api=ibm_bbapi', when='@0.1.0')
+
+    depends_on('kvtree')
+
+    def cmake_args(self):
+        args = []
+        if self.spec.satisfies('platform=cray'):
+            args.append("-DAXL_LINK_STATIC=ON")
+        args.append("-DWITH_KVTREE_PREFIX=%s" % self.spec['kvtree'].prefix)
+
+        apis = self.spec.variants['async_api'].value.split(',')
+        if 'daemon' in apis:
+            args.append('-DAXL_ASYNC_DAEMON=ON')
+            apis.remove('daemon')
+
+        for api in apis:
+            args.append('-DAXL_ASYNC_API={0}'.format(api))
+
+        return args