=> Bootstrap dependency digest>=20010302: found digest-20180917
=> Checksum SHA1 OK for minitar-0.6.1.gem
=> Checksum RMD160 OK for minitar-0.6.1.gem
=> Checksum SHA512 OK for minitar-0.6.1.gem
mkdir: /tmp/pkgbuild/archivers/ruby-minitar: Permission denied
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/archivers/ruby-minitar