WebKitGTK+ is not building on Hurd at the moment but it's easy to fix, Debian is already doing it.
Created attachment 240337 [details]
Attachment 240337 [details] did not pass style-queue:
ERROR: Source/WTF/wtf/InlineASM.h:85: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] 
Total errors found: 1 in 3 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Committed r175115: <http://trac.webkit.org/changeset/175115>