Just saw that Bluetile 0.5.1 failed to build.
Looks like the problem is that Setup.lhs is using Text.Regex and this
dependency is not captured in the Cabal file, because Setup.lhs is not
technically part of the source code.
I don't know if you can fix that in the Debian package by adding the
dependency manually or something. But I thought it would be better
anyway, if the setup script doesn't have any extra dependencies. So I
uploaded Bluetile 0.5.2 to Hackage which doesn't need Text.Regex.