Commits
JP Simard committed af7a6e88b1d
Update SystemModules.md to reflect that jpeg may be installed elsewhere El Capitan's System Integrity Protection prevents the user from installing anything in `/usr/include` or `/usr/lib`, so use `/usr/local` instead, which is also where Homebrew installs `jpeg`. Also remove the statement about Homebrew’s jpeglib.h being correct because that's false.