Changes in v2:
- declare PYTHON_REQUIRED_USE only if not declared already
  (fixes issue when eclass is inherited multiple times)

Signed-off-by: Michał Górny <mgo...@gentoo.org>
---
 eclass/python-any-r1.eclass | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/eclass/python-any-r1.eclass b/eclass/python-any-r1.eclass
index 7a91507a600f..db8f23647cd1 100644
--- a/eclass/python-any-r1.eclass
+++ b/eclass/python-any-r1.eclass
@@ -1,4 +1,4 @@
-# Copyright 1999-2018 Gentoo Foundation
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: python-any-r1.eclass
@@ -171,6 +171,12 @@ _python_any_set_globals() {
                PYTHON_DEPS=${deps}
                readonly PYTHON_DEPS
        fi
+
+       if [[ ! ${PYTHON_REQUIRED_USE+1} ]]; then
+               # fake var to catch mistaken usage
+               PYTHON_REQUIRED_USE='I-DO-NOT-EXIST-IN-PYTHON-ANY-R1'
+               readonly PYTHON_REQUIRED_USE
+       fi
 }
 _python_any_set_globals
 unset -f _python_any_set_globals
-- 
2.22.0


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