The logic for adding qt3 and qt4 layers appears to have been broken with the qt4 addition. When LSB images are built with corelayerversion>=7 the bblayers.conf needs both qt3 and qt4. https://autobuilder.yoctoproject.org/main/builders/nightly-arm-lsb/builds/555/steps/BuildImages/logs/stdio is a log showing this break.
http://git.yoctoproject.org/cgit/cgit.cgi/yocto-autobuilder/commit/?id=51c6752e5199d0b8c6e91b595e6cdc4b7e198eae
Verified on https://autobuilder.yoctoproject.org/main/builders/nightly-arm-lsb/builds/591/steps/BuildImages/logs/stdio Build Configuration: BB_VERSION = "1.28.0" BUILD_SYS = "x86_64-linux" NATIVELSBSTRING = "Debian-7.9" TARGET_SYS = "arm-poky-linux-gnueabi" MACHINE = "qemuarm" DISTRO = "poky-lsb" DISTRO_VERSION = "2.0+snapshot-20160120" TUNE_FEATURES = "arm armv5 thumb dsp" TARGET_FPU = "soft" meta meta-yocto meta-yocto-bsp = "heads/master-next:f6669f148ba027343bae53248bd4a2ee763c0269" meta-qt4 = "heads/master:6e2d387577d12a6fe8d7fb44324aba590a6e95af" meta-qt3 = "heads/master:5233565c80db869f6f539f37f26ea6662d9dc5f6"