No make target "uImage" with Buildroot 2013.05

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http://unix.stackexchange.com – After enabling Linux Kernel option and setting the Kernel binary format to uImage, I always get the following error: make[1]: * No rule to make target `uImage'. Stop. My buildroot configuration is almost the default one. Any idea why it doesn't work anymore? (in an older revision it worked without errors) (HowTos)