I am trying to install octave ("brew install octave"). The link below is for the gist describing the issue in detail.
Copied from the build output:
ld: library not found for -lgfortran
Your gist shows version 0.9.3, and we are on 0.9.4. Please brew update, and reinstall gfortran. If this problem persists, open a new bug with new troubleshooting information.