epic depends on the "happy" build tools, but doesn't declare the dependency in its Cabal file
peti opened this issue · comments
Peter Simons commented
This leads to build errors such as this one: http://hydra.cryp.to/build/1042589/log/raw. Nix doesn't know that happy
is required to build this package, and thus it's not included in the chroot environment that compiles this package.