Sometimes upgrading needing to remove all dependencies

[Quantisan]

Perhaps this is because I haven't upgraded julia for a while, but when I upgraded it by brew rm then brew install --HEAD, it installs fine but brew test -v julia fails. Then I removed everything brew rm julia arpack-julia suite-sparse-julia, reinstalled, and then test passes. Is this a bug or should it just be in the readme as part of upgrade instruction?

[staticfloat]

I think we're just going to have to put that into the readme, as it can be due to many different things (upgraded gfortran, upgraded openblas, etc...). Could you submit a pull request modifying README.md detailing exactly what you had to do to make it work? Thanks!