Hi,

I was trying to improve the linux-libre PKGBUILD by trying to fix the bug #2103, PKGBUILD, however I cannot build it:
<pre>
$ sudo libremakepkg -n parabola-armv7h
[...]
| ==> Verifying source file signatures with gpg...
| linux-libre-4.19-gnu.tar.xz ... FAILED (unknown public key BCB7CF877E7D47A7)
| patch-4.19-gnu-4.19.2-gnu.xz ... FAILED (unknown public key BCB7CF877E7D47A7)
| logo_linux_clut224.ppm ... FAILED (unknown public key 227CA7C556B2BA78)
| logo_linux_mono.pbm ... FAILED (unknown public key 227CA7C556B2BA78)
| logo_linux_vga16.ppm ... FAILED (unknown public key 227CA7C556B2BA78)
| rcn-libre-4.19.2-armv7-x5.patch ... FAILED (unknown public key 227CA7C556B2BA78)
| ==> ERROR: One or more PGP signatures could not be verified!
| ==> ERROR: Could not download sources.
</pre>