==> Creating clean working copy [build]...done
==> Making package: ruby1.9-sinatra-contrib 1.3.1-1 (Sat Oct 10 23:20:14 EDT 2015)
==> Retrieving sources...
  -> Found sinatra-contrib-1.3.1.gem
==> Validating source files with sha512sums...
    sinatra-contrib-1.3.1.gem ... Passed
==> Making package: ruby1.9-sinatra-contrib 1.3.1-1 (Sat Oct 10 23:20:15 EDT 2015)
==> Checking runtime dependencies...
==> Installing missing dependencies...
error: target not found: ruby1.9-sinatra-arachni
==> ERROR: 'pacman' failed to install missing dependencies.
==> WARNING: Failed to remove installed dependencies.
==> ERROR: Build failed, check /chroot/x86_64/build/build