Saya sudah menginstal ini:
1 core/archlinux-keyring 20170104-1 [installed]
10 blackarch/blackarch-keyring 20140118-3 [installed]
Tetapi saya mendapat kesalahan saat melakukan upgrade libc++abi
dari aur:
==> Verifying source file signatures with gpg...
llvm-3.9.1.src.tar.xz ... FAILED (unknown public key 8F0871F202119294)
libcxx-3.9.1.src.tar.xz ... FAILED (unknown public key 8F0871F202119294)
libcxxabi-3.9.1.src.tar.xz ... FAILED (unknown public key 8F0871F202119294)
==> ERROR: One or more PGP signatures could not be verified!
==> ERROR: Makepkg was unable to build libc++.
==> Restart building libc++abi ? [y/N]
Bagaimana cara mengatasinya? (adakah cara untuk mengetahui keyring mana yang harus saya instal untuk mengatasi masalah ini?)