add new package : libdap4 (#14267)

var/spack/repos/builtin/packages/libdap4/package.py

+# 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 Libdap4(AutotoolsPackage):
+    """
+    libdap4 is is a c++ library to serve as a client for the OPeNDAP framework
+    that simplifies all aspects of scientific data networking and provides
+    software which makes local data accessible to remote locations regardless
+    of local storage format.
+    """
+
+    homepage = "https://www.opendap.org/"
+    url      = "https://github.com/OPENDAP/libdap4/archive/version-3.20.4.tar.gz"
+
+    maintainers = ['tjhei']
+
+    version('3.20.4', sha256='c39fa310985cc8963029ad0d0aba784e7dbf1f70c566bd7ae58242f1bb06d24a')
+
+    depends_on('autoconf', type='build')
+    depends_on('automake', type='build')
+    depends_on('libtool',  type='build')
+    depends_on('m4',       type='build')
+    depends_on('bison',    type='build')
+
+    depends_on('flex')
+    depends_on('curl')
+    depends_on('libxml2')
+    depends_on('libuuid')
+
+    def configure_args(self):
+        # libxml2 exports ./include/libxml2/ instead of ./include/, which we
+        # need, so grab this path manually:
+        libxml2_include = self.spec['libxml2'].prefix.include
+        args = ['CPPFLAGS=-I{0}'.format(libxml2_include)]
+        return args