Arnaud Lefebvre 22121ca2b2 Use PKG_CONFIG environment variable if it exists
pkg-config is not always available in the path
so let people choose where it's located

Signed-off-by: Arnaud Lefebvre <a.lefebvre@outlook.fr>
Upstream-commit: 20bf00dfa56ef9584d25777031ac4d11360386a8
Component: engine
2016-06-02 21:53:28 +02:00
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