Fixing GCC/Homebrew building issues on macOS?

[djsegal]

is this at all related to:

Anyone know status of HDF5 build problems?

Just got this working about the same time you posted this. I think the thing that got me closest to the solution was doing: brew install hdf5 in the terminal. And then Pkg.build("HDF5") in the REPL but stuff like this is always hard to remember how to solve? I think doing stuff like: brew doctor brew update and softwareupdate --install -a also helped. Good luck! @andreasnoack @denizyuret, are those things you did to get JLD working on macs?