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ENOSPC when building with devtools

devtools uses systemd-nspawn, which by default mounts a tmpfs with size=10% to the /tmp directory inside the container. This may not be enough for e.g. large LTO-enabled packages.

A possible workaround is to instruct systemd-nspawn to not mount a tmpfs and use the directory as is:

# SYSTEMD_NSPAWN_TMPFS_TMP=0 extra-x86_64-build