Hi Yawor, thanks. So flirc_util is inside the Flirc.app package. I get there by either 1) Go Applications / Flirc, Right Click, Show Package Contents, Go Contents / Resources / flirc_util; or 2) the same in Terminal: Open Terminal and type /Applications/Flirc.app/Contents/Resources/flirc_util. With either method, running flirc_util returns the following error. dyld: Library not loaded: /usr/local/lib/libusb-1.0.0.dylib Referenced from: /Applications/Flirc.app/Contents/Resources/flirc_util Reason: image not found Trace/BPT trap: 5 I then followed the instructions on this thread http://forum.flirc.tv/index.php?/topic/841-mac-flirc_util-embedded-in-flircapp-cant-find-libusb-100dylib/#comment-6791 to try to add libusb-1.0.0.dylib to the required folder cp /Applications/Flirc.app/Contents/Frameworks/libusb-1.0.* /usr/local/lib/ Following that method I get this error. cp: directory /usr/local/lib does not exist I'll be honest I'm a little out of depth using Terminal commands. ... Edit: Worked it out! See below.