When len(TMPDIR) == 410: $ bitbake webkitgtk i586-poky-linux-g++: error trying to exec [snip] execv: Argument list too long
Looking into.
This builds fine with 410+ tmp dir on master. Its not clear at what point it was fixed, but I would assume it was fixed in 2 years worth of updates. If this still fails to build for you reopen.