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Cannot open load file: subst-ksc - os x 10.9.2, emacs 24.4.50.1

· emacs elisp subst-ksc subst-gb2312 mysterious but stupid errors symlink homebrew emacs24.4 cask ert-runner cask exec ert-runner me writing self

I'm on OS X Mavericks 10.9.2, running Emacs 24.4.50.1 GNU Emacs 24.4.50.1 (x86_64-apple-darwin13.1.0, NS apple-appkit-1265.19) compiled via homebrew. I was trying to get back into Emacs package authoring with the help of rejeep's excellent Cask and ert-runner tools, but I was getting an error that didn't pop up on Google very well:

bash-3.2$ cask exec emacs -batch -l test/grunt-test.el
Cannot open load file: subst-ksc

Searching for subst-ksc on google pops up results from other OS X users from two or three years ago and no obvious fixes. I tried a couple different things and ended up putting a fake subst-ksc.el file in my load path with (provide 'subst-ksc) in it just to push past the error, but that just gave more of the same:

bash-3.2$ cask exec emacs -batch -l test/grunt-test.el
Cannot open load file: subst-gb2312

Eventually, I realized via $ emacs --version that I recently switched to a new computer where I didn't symlink/replace the default /usr/bin/emacs binary with my newer homebrew'd version. I tried the new method recommended in the comments of replacing that file with a short shell script to invoke the proper emacs:

#!/bin/sh
/Applications/Emacs.app/Contents/MacOS/Emacs "$@"

and all became well.