lib32-libevdev AUR install error

Preparing...

Building lib32-libevdev...
Cloning into 'lib32-libevdev'...
remote: Counting objects: 19, done.
remote: Compressing objects: 100% (17/17), done.
remote: Total 19 (delta 2), reused 19 (delta 2)
Unpacking objects: 100% (19/19), done.
==> Making package: lib32-libevdev 1.5.6-1 (Mon Apr  9 13:31:25 CDT 2018)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Downloading libevdev-1.5.6.tar.xz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  397k  100  397k    0     0   491k      0 --:--:-- --:--:-- --:--:--  490k
  -> Downloading libevdev-1.5.6.tar.xz.sig...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    72  100    72    0     0    258      0 --:--:-- --:--:-- --:--:--   258
==> Validating source files with sha256sums...
    libevdev-1.5.6.tar.xz ... Passed
    libevdev-1.5.6.tar.xz.sig ... Skipped
==> Verifying source file signatures with gpg...
    libevdev-1.5.6.tar.xz ... FAILED (unknown public key E23B7E70B467F0BF)
==> ERROR: One or more PGP signatures could not be verified!