Something wrong is there:

31. 1. 2015 v 20:43, Christian Sandrini <christian.sandrini@me.com>:

For now therion still needs VTK5. While by default it tries to install VTK6.

==> Installing therion
==> Downloading http://therion.speleo.sk/downloads/therion-5.3.15.tar.gz
######################################################################## 100,0%
==> make config-macosx
==> make
         ^
1 error generated.
make[1]: *** [.././loch/lxSetup.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [loch/loch] Error 2

READ THIS: http://git.io/brew-troubleshooting
If reporting this issue please do so at (not Homebrew/homebrew):
  https://github.com/homebrew/homebrew-science/issues

M.S.