For what I could see in the source the solution is to either set CLANGXX (maybe check if it is not defined and then define it?) or modifying the script in another way.
At least in unstable this is not a problem right now as the default LLVM is now 7, but a more robust solution could help. -- Antiguo proverbio de El Machi: "Dado el apropiado grado de profundidad, la ineptitud es indistinguible del sabotaje" Lisandro Damián Nicanor Pérez Meyer http://perezmeyer.com.ar/ http://perezmeyer.blogspot.com/
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