illusion:~ uplime% prt-get path npm
/usr/ports/tb/npm
illusion:~ uplime% sudo prt-get depinst npm
prt-get: installing /usr/ports/tb/npm
=======> ERROR: Signature mismatch found:
MISMATCH	signify
=======> ERROR: Building '/usr/ports/tb/npm/npm#6.11.3-1.pkg.tar.gz' failed.
prt-get: error while install

-- Packages where install failed
npm

illusion:~ uplime%