Tried with the => :build.

Running brew install puzzles afterwards generates 

Already downloaded: /Library/Caches/Homebrew/halibut-1.0.tar.gz
==> make prefix=/usr/local/Cellar/halibut/1.0 mandir=/usr/local/Cellar/halibut/1.0/share/man all
 ^
2 errors generated.
make[1]: *** [cs-slookup.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [all] Error 2


But if I run 'brew install halibut' it gets installed.