Merge branch 'mplegendre-multi_pkgsrc_roots' into develop

- This moves var/spack/packages to var/spack/repos/builtin/packages.

- Packages that did not exist in the source branch, or were changed in
  develop, were moved into var/spack/repos/builtin/packages as part of
  the integration.

Conflicts:
	lib/spack/spack/test/unit_install.py
	var/spack/repos/builtin/packages/clang/package.py

var/spack/repos/builtin/packages/fftw/package.py

@@ -0,0 +1,75 @@
+##############################################################################
+# Copyright (c) 2013, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Written 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 General Public License (as published by
+# the Free Software Foundation) version 2.1 dated 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 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 Fftw(Package):
+    """
+    FFTW is a C subroutine library for computing the discrete Fourier transform (DFT) in one or more dimensions, of
+    arbitrary input size, and of both real and complex data (as well as of even/odd data, i.e. the discrete cosine/sine
+    transforms or DCT/DST). We believe that FFTW, which is free software, should become the FFT library of choice for
+    most applications.
+    """
+    homepage = "http://www.fftw.org"
+    url      = "http://www.fftw.org/fftw-3.3.4.tar.gz"
+
+    version('3.3.4', '2edab8c06b24feeb3b82bbb3ebf3e7b3')
+
+    variant('float', default=True, description='Produces a single precision version of the library')
+    variant('long_double', default=True, description='Produces a long double precision version of the library')
+    variant('quad', default=False, description='Produces a quad precision version of the library (works only with GCC and libquadmath)')
+
+    variant('mpi', default=False, description='Activate MPI support')
+
+    depends_on('mpi', when='+mpi')
+
+    def install(self, spec, prefix):
+        options = ['--prefix=%s' % prefix,
+                   '--enable-shared',
+                   '--enable-threads',
+                   '--enable-openmp']
+        if not self.compiler.f77 or not self.compiler.fc:
+            options.append("--disable-fortran")
+        if '+mpi' in spec:
+            options.append('--enable-mpi')
+
+        configure(*options)
+        make()
+        make("install")
+
+        if '+float' in spec:
+            configure('--enable-float', *options)
+            make()
+            make("install")
+        if '+long_double' in spec:
+            configure('--enable-long-double', *options)
+            make()
+            make("install")
+        if '+quad' in spec:
+            configure('--enable-quad-precision', *options)
+            make()
+            make("install")