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In commit360a7cd738("package/systemd: bump linux-headers dependency to 4.14"), the headers requirements were bumped to 4.14 because of new build failures due to LOOP_SET_BLOCK_SIZE. Even though systemd does not recommend using it with headers < 4.15 (see [1]), it is still possible to build it and use some of its features (after fixing the build failure). Note that this was build-tested with 4.4 headers only, and not all the way back to 3.15 (which is the version requirement that was used before360a7cd738). [1]: https://github.com/systemd/systemd/blob/main/README Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>