Derivations with "preferLocalBuild = true" can now be executed on specific machines (typically localhost) by setting the mandary system features field to include "local". For example: localhost x86_64-linux,i686-linux - 10 100 - local says that "localhost" can *only* do builds with "preferLocalBuild = true". The speed factor of 100 will make the machine almost always win over other machines.
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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