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+#!/usr/bin/env python3
+#
+# Copyright (C) 2016 Codethink Limited
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library. If not, see <http://www.gnu.org/licenses/>.
+#
+# Authors:
+# Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
+
+
+# The base BuildStream format version
+#
+# This version is bumped whenever enhancements are made
+# to the `project.conf` format or the core element format.
+#
+BST_FORMAT_VERSION = 6
+
+
+# The base BuildStream artifact version
+#
+# The artifact version changes whenever the cache key
+# calculation algorithm changes in an incompatible way
+# or if buildstream was changed in a way which can cause
+# the same cache key to produce something that is no longer
+# the same.
+BST_CORE_ARTIFACT_VERSION = 1