build-webkit is printing the launcher-path relative to the current working directory at the end of the script, but is not taking into account that the script will exit to it's original working directory. For --qt builds, this means that the path is relative to the WebKitBuild dir and causes an extra ../ at the beginning.
Created attachment 132386 [details] Patch
Looks good to me. Fixes the problem and get's rid of a bogus assumption.
Comment on attachment 132386 [details] Patch OK.
Comment on attachment 132386 [details] Patch Clearing flags on attachment: 132386 Committed r111093: <http://trac.webkit.org/changeset/111093>
All reviewed patches have been landed. Closing bug.