new package: pngquant (#12609)

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

@@ -0,0 +1,18 @@
+# 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 Pngquant(AutotoolsPackage):
+    """
+    pngquant is a command-line utility and a library for lossy compression of
+    PNG images.
+    """
+
+    homepage = "https://pngquant.org/"
+    url      = "http://pngquant.org/pngquant-2.12.5-src.tar.gz"
+
+    version('2.12.5', sha256='3638936cf6270eeeaabcee42e10768d78e4dc07cac9310307835c1f58b140808')