$ sudo prt-get depinst ostree
prt-get: installing /usr/ports/tb/ostree
=======> ERROR: Signature mismatch found:
MISMATCH	signify
=======> ERROR: Building '/usr/ports/tb/ostree/ostree#2018.6-1.pkg.tar.gz' failed.
prt-get: error while install

-- Packages where install failed
ostree