==> Creating clean working copy [build]...done
==> Making package: ruby-uglifier 2.3.0-1 (Tue Jan  5 09:00:03 EST 2016)
==> Retrieving sources...
  -> Found uglifier-2.3.0.gem
==> Validating source files with md5sums...
    uglifier-2.3.0.gem ... Passed

==> ERROR: Build failed, check /chroot/x86_64/build/build