In my vagrant setup, I started to face this probelm recently.
root@dhcplb:~# go get github.com/facebookincubator/dhcplb
/opt/go/src/github.com/facebookincubator/dhcplb/lib/handler.go:276:24: undefined: dhcpv6.OptClientId
root@dhcplb:~# go version
go version go1.13 linux/amd64
In my vagrant setup, I started to face this probelm recently.
root@dhcplb:~# go get github.com/facebookincubator/dhcplb /opt/go/src/github.com/facebookincubator/dhcplb/lib/handler.go:276:24: undefined: dhcpv6.OptClientId
root@dhcplb:~# go version go version go1.13 linux/amd64