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Bitbake errors

Q. A typical bitbake error

$ bitbake console-image
ERROR:  Openembedded's config sanity checker detected a potential misconfiguration.
  Either fix the cause of this error or at your own risk disable the checker (see sanity.conf).
  Following is the list of potential problems / advisories:
  /proc/sys/vm/mmap_min_addr is not 0. This will cause problems with qemu so please fix the value (as root).
To fix this in later reboots, set vm.mmap_min_addr = 0 in /etc/sysctl.conf.

A. could be solved with

# echo 0 > /proc/sys/vm/mmap_min_addr