I had this on SO http://stackoverflow.com/questions/24339276/gitbook-error-on-need-to-install-ebook-convert-from-calibre The CLI is available ``` $ ebook-convert Usage: ebook-convert input_file output_file [options] Convert an ebook from one format to another. ``` But I still got error below when converting to PDF ``` Need to install ebook-convert from Calibre ``` The error may be something else but I can't find the log or figure out why. Mac 10.9.3 I have both Xcode 5 and 6-Beta. Maybe that's why?