New package lesstif (#15703)

* new package lesstif

* incorporate more of the Homebrew build recipe

Co-authored-by: Daryl W. Grunau <dwg@lanl.gov>

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

@@ -0,0 +1,51 @@
+# 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 Lesstif(AutotoolsPackage):
+    """LessTif is the Hungry Programmers' version of OSF/Motif."""
+
+    homepage = "https://sourceforge.net/projects/lesstif"
+    url      = "https://sourceforge.net/projects/lesstif/files/lesstif/0.95.2/lesstif-0.95.2.tar.bz2/download"
+
+    version('0.95.2', sha256='eb4aa38858c29a4a3bcf605cfe7d91ca41f4522d78d770f69721e6e3a4ecf7e3')
+
+    variant('shared', default=True, description='Build shared libraries')
+    variant('static', default=False, description='Build static libraries')
+
+    depends_on('libice')
+    depends_on('libsm')
+    depends_on('libxt')
+
+    def patch(self):
+        filter_file("ACLOCALDIR=.*",
+                    "ACLOCALDIR='${datarootdir}/aclocal'",
+                    "configure")
+
+    def setup_build_environment(self, env):
+        # 'sed' fails if LANG=en_US.UTF-8 as is often the case on Macs.
+        # The configure script finds our superenv sed wrapper, sets
+        # SED, but then doesn't use that variable.
+        env.set('LANG', 'C')
+
+    def configure_args(self):
+        spec = self.spec
+
+        args = [
+            '--disable-debug',
+            '--enable-production',
+            '--disable-dependency-tracking',
+            '--enable-shared' if '+shared' in spec else '--disable-shared',
+            '--enable-static' if '+static' in spec else '--disable-static',
+        ]
+
+        return args
+
+    # LessTif won't install in parallel 'cause several parts of the
+    # Makefile will try to make the same directory and `mkdir` will fail.
+    def install(self, spec, prefix):
+        make('install', parallel=False)