add new package : brltty (#15161)

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

+# 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 Brltty(AutotoolsPackage):
+    """BRLTTY is a background process (daemon) providing access to the
+    Linux/Unix console (when in text mode) for a blind person using
+    a refreshable braille display."""
+
+    homepage = "http://brltty.app/"
+    url      = "https://github.com/brltty/brltty/archive/BRLTTY-6.0.tar.gz"
+
+    version('6.0', sha256='acfea5274bdc9230b0ea1a87f8796e241615d4d2c1ba08d87601b9d116c7804c')
+    version('5.6', sha256='74f35043943525396b340b9f65f0d73c3cc4054a8f63d1c685f27ccf59f46c5d')
+    version('5.5', sha256='cd80a0d225f13779791dc3a72d7f137c06c48e5f2c9600e80a565d2378422207')
+    version('5.4', sha256='9ad5a540d29438a755f8b8f1f1534e0eba601c604f3d8223fa00b802959ec636')
+
+    depends_on('autoconf',  type='build')
+    depends_on('automake',  type='build')
+    depends_on('libtool',   type='build')
+    depends_on('m4',        type='build')
+    depends_on('expat')
+
+    def autoreconf(self, spec, prefix):
+        bash = which('bash')
+        bash('autogen')