[0] % sudo -u hostsblock hostsblock -u
Checking blocklists for updates...
Changes found among blocklists. Extracting and preparing cached files to working directory...
/usr/bin/hostsblock: line 461: [: /etc/hosts.bak: integer expression expected
Compiling into /var/lib/hostsblock/hosts.block...
Relevant line:
This is on Arch linux - hostsblock 0.999.6-3