Add new package: diffmark (#18930)

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

@@ -0,0 +1,21 @@
+# Copyright 2013-2020 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 Diffmark(AutotoolsPackage):
+    """Diffmark is a DSL for transforming one string to another."""
+
+    homepage = "https://github.com/vbar/diffmark"
+    git      = "https://github.com/vbar/diffmark.git"
+
+    version('master', branch='master')
+
+    depends_on('autoconf', type='build')
+    depends_on('automake', type='build')
+    depends_on('libtool',  type='build')
+    depends_on('m4',       type='build')
+    depends_on('libxml2')