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diff --git a/var/spack/repos/builtin/packages/clapack/package.py b/var/spack/repos/builtin/packages/clapack/package.py
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+# Copyright 2013-2018 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 Clapack(MakefilePackage):
+    """CLAPACK is a f2c'ed version of LAPACK.
+
+       The CLAPACK library was built using a Fortran to C conversion utility
+    called f2c.  The entire Fortran 77 LAPACK library is run through f2c to
+    obtain C code, and then modified to improve readability.  CLAPACK's goal
+    is to provide LAPACK for someone who does not have access to a Fortran
+    compiler."""
+
+    homepage = "http://www.netlib.org/clapack/"
+    url      = "http://www.netlib.org/clapack/clapack.tgz"
+
+    version('3.2.1', '040da31f3a7d4fbc9ac376c748d18d1f')
+
+    variant('external-blas', default=True,
+            description='Build with external BLAS (ATLAS here).')
+
+    depends_on('atlas', when='+external-blas')
+
+    def edit(self, spec, prefix):
+        copy('make.inc.example', 'make.inc')
+        if '+external-blas' in spec:
+            make_inc = FileFilter('make.inc')
+            make_inc.filter(r'^BLASLIB.*',
+                            'BLASLIB = ../../libcblaswr.a -lcblas -latlas')
+            makefile = FileFilter('Makefile')
+            makefile.filter(r'^lib.*',
+                            'lib: variants lapacklib tmglib')
+
+    def build(self, spec, prefix):
+        make('f2clib')
+        make('cblaswrap' if '+external-blas' in spec else 'blaslib')
+        make('lib')
+
+    def install(self, spec, prefix):
+        install_tree('.', prefix)