Hello,

in this commit

http://git.savannah.gnu.org/cgit/guix.git/commit/?id=f62acf1eb7ae9f3a582e897abbbfb229f112b31e

linux-libre-4.9 was updated from 4.9.18 to 4.9.19

The downloaded tarball hashes to
1864sbq2r5y7fi26hla9k4avzs6sprkpgwpq8gi0sr39i58z6hnz

but the defined package has
19x6hasx7pvrjj08vy8mhylx1s63j3dwxzgqh4k18jwzjfkv3p3g

so if you try to build it, it will fail claiming that the hash is different