The e2fsprogs contains a version 1.0.0 of `blkid`. This version does not support flags that the current kernel install scripts pass to `blkid`. By building and installing e2fsprogs I ended up replacing blkid 2.30.2 with 1.0.0, which broke kernel packaging. This is easily fixed by doing `yum reinstall util-linux`, which reinstalls the correct version blkid. This mess could be avoided if e2fsprogs either included a more modern version of blkid, or perhaps did not include blkid at all, since a more current version of this utility is maintained and installed through other packages. (Finding https://forums.centos.org/viewtopic.php?t=69655 helped a lot in figuring out why my kernel build started failing all of a sudden)
