[aur-general] Can't build staging/testing packages using devtools

[Sven-Hendrik Haase]

I noticed I can't build any staging or testing packages in a clean
chroot using the usual *-build scripts. My host system is using all
stable packages (no pacman 4 whatsoever). The error I get during
maketime is:

$ sudo staging-x86_64-build

[many packages]

Total Installed Size:   149.09 MiB

Proceed with installation? [Y/n]
(46/46) checking package integrity                  
[###########################] 100%
error: GPGME error: Inappropriate ioctl for device
error: GPGME error: Inappropriate ioctl for device
error: GPGME error: Inappropriate ioctl for device
error: GPGME error: Inappropriate ioctl for device
error: GPGME error: Inappropriate ioctl for device
error: GPGME error: Inappropriate ioctl for device
error: failed to commit transaction (invalid or corrupted package (PGP
signature))
Errors occurred, no packages were upgraded.
==> ERROR: 'pacman' failed to install missing dependencies.
Build failed, check /var/tmp/archbuild/staging-x86_64/svenstaro/build

This works fine on alderaan.

-- Sven-Hendrik