extempore only compiles on x86_64; elsewhere it fails with the message
CMake Error at CMakeLists.txt:82 (message):
Extempore currently only runs on 64-bit platforms.
(which is not the full truth...):
Could you disable the other architectures?
Maybe this should also be done for the *-for-extempore packages, since
there is no need to waste hydra cycles on otherwise unused packages.
I would also hide them using "define" instead of "define-public", which
would require to put them into the same module as extempore itself.
What do you think?