init nfft 3.3.2 package file (#2612)

* init nfft 3.3.2 package file

* shorten comment line

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

+##############################################################################
+# 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 Nfft(AutotoolsPackage):
+    """NFFT is a C subroutine library for computing the nonequispaced discrete
+    Fourier transform (NDFT) in one or more dimensions, of arbitrary input
+    size, and of complex data."""
+
+    homepage = "https://www-user.tu-chemnitz.de/~potts/nfft"
+    url = "https://www-user.tu-chemnitz.de/~potts/nfft/download/nfft-3.3.2.tar.gz"
+
+    version('3.3.2', '550737c06f4d6ea6c156800169d8f0d9')
+
+    depends_on('fftw')
+
+    def install(self, spec, prefix):
+        options = ['--prefix={0}'.format(prefix)]
+
+        configure(*options)
+        make()
+        if self.run_tests:
+            make("check")
+        make("install")
+
+        if '+float' in spec['fftw']:
+            configure('--enable-float', *options)
+            make()
+            if self.run_tests:
+                make("check")
+            make("install")
+        if '+long_double' in spec['fftw']:
+            configure('--enable-long-double', *options)
+            make()
+            if self.run_tests:
+                make("check")
+            make("install")