This is necessary because the required system type can become available later (e.g. by being provisioned by the auto-scaler). However, in the future, we may want to fail steps if they have been unsupported for more than a certain amount of time.
To start hacking on Hydra, run:
$ ./dev-shell
$ ./configure $configureFlags --prefix=/opt/hydra
$ make
$ make install
Or, if you just want to build from source (on x86_64-linux):
$ nix-build -A build.x86_64-linux release.nix
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