I'm running Manjaro Linux and trying to install Discord app. Since Discord doesn't have an official build for Arch-based systems, I've tried to use yaourt and the install gives me this error:
==> Verifying source file signatures with gpg... llvm-6.0.0.src.tar.xz ... FAILED (unknown public key 0FC3042E345AD05D) libcxx-6.0.0.src.tar.xz ... FAILED (unknown public key 0FC3042E345AD05D) libcxxabi-6.0.0.src.tar.xz ... FAILED (unknown public key 0FC3042E345AD05D) ==> ERROR: One or more PGP signatures could not be verified! ==> ERROR: Makepkg was unable to build libc++. ==> Restart building libc++ ? [y/N]
So even if I type "Y" to restart the build, it doesn't work because it stops at the same error again.
Is there a way to get those three public keys and manually point to them? Or another way to install the package?