http://trac.webkit.org/changeset/59196 caused some strange behavior on the Gtk bot, where the correct files were not rebuilt. http://build.webkit.org/builders/GTK%20Linux%2064-bit%20Release/builds/3330/steps/compile-webkit/logs/stdio These issues seemed to be fixed by a clean build.
Thanks for filing this brian. This seems like a dependency issue in the Gtk build system. Bad news bears. This type of error makes it very hard to support Gtk build bots as they hose themselves randomly. :(
The build system has been replaced with CMake.