I ran in the same problem as I was trying to install a module (django-piston
) from source as the last official release is a bit old and lacks some bug fixes that are crucial to me. Anyway, there has been an issue opened before, and I actually got a reply from support.
It seems a bit odd to me, but at least it works (just choose any python release number in runtime.txt
, rebuild, and then change back to your desired runtime and rebuild again)