Add fpocket (#12675)

* Add fpocket

* fix recipe

break down the description to pass lint

* update license

* make changes as per maintainer's review

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

@@ -0,0 +1,26 @@
+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class Fpocket(MakefilePackage):
+    """fpocket is a very fast open source protein pocket detection algorithm
+       based on Voronoi tessellation."""
+
+    homepage = "https://github.com/Discngine/fpocket"
+    version('master', branch='master',
+            git='https://github.com/Discngine/fpocket.git')
+
+    depends_on("netcdf")
+
+    def setup_environment(self, spack_env, run_env):
+        if self.compiler.name == 'gcc':
+            spack_env.set('CXX', 'g++')
+
+    def edit(self):
+        makefile = FileFilter('makefile')
+        makefile.filter('BINDIR .*', 'BINDIR = %s/bin' % self.prefix)
+        makefile.filter('MANDIR .*', 'MANDIR = %s/man/man8' % self.prefix)