New package: apfel (#21440)

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

@@ -0,0 +1,35 @@
+# Copyright 2013-2021 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 Apfel(AutotoolsPackage):
+    """APFEL is a library able to perform DGLAP evolution up to NNLO in QCD and
+       to NLO in QED, both with pole and MSbar masses. The coupled DGLAP
+       QCD+QED evolution equations are solved in x-space by means of higher
+       order interpolations and Runge-Kutta techniques."""
+
+    homepage = "https://github.com/scarrazza/apfel"
+    url      = "https://github.com/scarrazza/apfel/archive/3.0.4.tar.gz"
+
+    version('3.0.4', sha256='c7bfae7fe2dc0185981850f2fe6ae4842749339d064c25bf525b4ef412bbb224')
+
+    depends_on('swig', when='+python')
+    depends_on('python', when='+python', type=('build', 'run'))
+    depends_on('lhapdf', when='+lhapdf', type=('build', 'run'))
+
+    variant('python', description='Build python wrapper', default=False)
+    variant('lhapdf', description='Link to LHAPDF', default=False)
+
+    def configure_args(self):
+        args = []
+        if self.spec.satisfies('~python'):
+            args.append('--disable-pywrap')
+        else:
+            args.append('--enable-pywrap')
+
+        args += self.enable_or_disable('lhapdf')
+        return args