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diff --git a/var/spack/repos/builtin.mock/packages/conditional-provider/package.py b/var/spack/repos/builtin.mock/packages/conditional-provider/package.py
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index 0000000000..e95f2ad54c
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+++ b/var/spack/repos/builtin.mock/packages/conditional-provider/package.py
@@ -0,0 +1,18 @@
+# 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)
+class ConditionalProvider(Package):
+ """Mimic the real netlib-lapack, that may be built on top of an
+ optimized blas.
+ """
+ homepage = "https://dev.null"
+
+ version('1.0')
+
+ variant('disable-v1', default=False, description='nope')
+
+ provides('v2')
+ provides('v1', when='~disable-v1')
+
+ depends_on('v1', when='+disable-v1')