freesasa: add new package (#35192)

Co-authored-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

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

@@ -0,0 +1,41 @@
+# Copyright 2013-2022 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.package import *
+
+
+class Freesasa(AutotoolsPackage):
+    """C-library for calculating Solvent Accessible Surface Areas"""
+
+    homepage = "http://freesasa.github.io"
+    url = "https://github.com/mittinatten/freesasa/releases/download/2.1.2/freesasa-2.1.2.zip"
+    git = "https://github.com/mittinatten/freesasa.git"
+    maintainers("RMeli")
+
+    version("2.1.2", sha256="a031c4eb8cd59e802d715a37ef72930ec2d90ec53dfcf1bea0b0255980490fd5")
+
+    variant("json", default=True)
+    variant("xml", default=True)
+    variant("threads", default=True)
+
+    depends_on("autoconf", type="build")
+    depends_on("automake", type="build")
+    depends_on("libtool", type="build")
+    depends_on("m4", type="build")
+    # https://github.com/mittinatten/freesasa/issues/88
+    depends_on("pkg-config", type="build")
+
+    depends_on("json-c", when="+json")
+    depends_on("libxml2", when="+xml")
+
+    def autoreconf(self, spec, prefix):
+        autoreconf("--install", "--verbose", "--force")
+
+    def configure_args(self):
+        args = []
+        args.extend(self.enable_or_disable("json"))
+        args.extend(self.enable_or_disable("xml"))
+        args.extend(self.enable_or_disable("threads"))
+        return args