The script filter-build-webkit was added in http://trac.webkit.org/changeset/94746. For more info, read: https://bugs.webkit.org/show_bug.cgi?id=44081 BUT it has only been tested on the output of build-webkit on the Mac port (using the usual xcode commandline build tools). Other ports that might benefit from using this script both in their bots and during development should: 1) Try it out; it has colors!. If it's perfect, jump to step 4. 2) Modify it to better filter your build output. 3) Check that your mods don't mess up other ports by making sure that the diff is clean between their attached sample <PORT>_FILTERED_OUTPUT and the output of running your modded filter-build-webkit against their sample <PORT>_BUILDLOG 4) Upload a sample of your <PORT>_FILTERED_OUTPUT and <PORT>_BUILDLOG for others to use. This bug can be used for patches to modify the script and be kept open until all ports are good. I'll add the MAC_FILTERED_OUTPUT and MAC_BUILDLOG files shortly...