linux-ppc64-head (Linux/ppc64 HEAD (Karel Gardas)), build 550, Failure

[Builder]

linux-ppc64-head (Linux/ppc64 HEAD (Karel Gardas)), build 550

Build failed
Details: http://haskell.inf.elte.hu/builders/linux-ppc64-head/550.html

git clone                    | Success
git clone (Windows tarballs) | Success
create mk/build.mk           | Success
repo versions                | Success
touching clean-check files   | Success
setting version date         | Success
booting                      | Failure: Just (ExitFailure 127)

Build failed
Details: http://haskell.inf.elte.hu/builders/linux-ppc64-head/550.html

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/usr/bin/env: python3: No such file or directory