Well seems every platform is a bit different. The ip route command works a bit different from Debian to Redhat. Here are the errors when I tried to run rip44d on CentOS platform:
route del failed: 'LANG=C /sbin/ip route del 44.183.0.0/255.255.0.0': Error: an inet prefix is expected rather than "44.183.0.0/255.255.0.0".
route add failed: 'LANG=C /sbin/ip route add 44.183.0.0/255.255.0.0 via 130.208.168.63 dev tunl0 window 840 onlink': Error: an inet prefix is expected rather than "44.183.0.0/255.255.0.0".
route del failed: 'LANG=C /sbin/ip route del 44.208.0.0/255.255.0.0': Error: an inet prefix is expected rather than "44.208.0.0/255.255.0.0".
route add failed: 'LANG=C /sbin/ip route add 44.208.0.0/255.255.0.0 via 94.101.48.134 dev tunl0 window 840 onlink': Error: an inet prefix is expected rather than "44.208.0.0/255.255.0.0".
route del failed: 'LANG=C /sbin/ip route del 44.142.0.0/255.254.0.0': Error: an inet prefix is expected rather than "44.142.0.0/255.254.0.0".
route add failed: 'LANG=C /sbin/ip route add 44.142.0.0/255.254.0.0 via