Please build core-image-minimal and core-image-basic with the INCOMPATIBLE_LICENSE = "GPLv3"
gawk was the one that failed with this setting, maybe the only one.
tested, and fixes posted here: http://git.yoctoproject.org/cgit/cgit.cgi/poky-contrib/log/?h=nitin/automake_update_on_master
Setting this to verified as core-image-basic (with INCOMPATIBLE_LICENSE = "GPLv3") builds without issues (and with gawk included)