Won't work with etcd v3.3.26 & go 1.16.2

[SLoeuillet]

(ansible) sloeuillet@sloeuillet-kaiko:~$ go get github.com/coreswitch/zebra/rib/ribd
go: downloading github.com/coreswitch/zebra v1.8.1
go: downloading github.com/coreos/etcd v0.5.0-alpha.5
go: downloading github.com/golang/protobuf v1.5.2
go: downloading github.com/mitchellh/mapstructure v1.4.2
go: downloading github.com/howeyc/fsnotify v0.9.0
go: downloading golang.org/x/net v0.0.0-20211007125505-59d4e928ea9d
go: downloading github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f
go: downloading github.com/vishvananda/netlink v1.1.0
go: downloading google.golang.org/grpc v1.41.0
go: downloading github.com/coreos/etcd v3.3.26+incompatible
go: downloading github.com/coreswitch/netutil v1.0.0
go: downloading github.com/coreswitch/component v1.0.0
go: downloading github.com/coreswitch/openconfigd v0.8.1
go: downloading github.com/coreswitch/log v0.0.0-20180520054427-319a7dcf0937
go: downloading github.com/coreswitch/cmd v0.0.0-20171009065211-39afb7adac20
go: downloading golang.org/x/sys v0.0.0-20210423082822-04245dca01da
go: downloading google.golang.org/protobuf v1.26.0
go: downloading github.com/google/uuid v1.1.2
go: downloading github.com/sirupsen/logrus v1.8.1
go: downloading github.com/coreos/go-semver v0.3.0
go: downloading github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f
go: downloading go.uber.org/zap v1.19.1
go: downloading github.com/gogo/protobuf v1.3.2
go: downloading github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf
go: downloading github.com/coreswitch/dependency v1.0.0
go: downloading golang.org/x/sys v0.0.0-20210510120138-977fb7262007
go: downloading go.uber.org/atomic v1.7.0
go: downloading go.uber.org/multierr v1.6.0
# github.com/coreos/etcd/clientv3/balancer/resolver/endpoint
go/pkg/mod/github.com/coreos/etcd@v3.3.26+incompatible/clientv3/balancer/resolver/endpoint/endpoint.go:114:78: undefined: resolver.BuildOption
go/pkg/mod/github.com/coreos/etcd@v3.3.26+incompatible/clientv3/balancer/resolver/endpoint/endpoint.go:182:31: undefined: resolver.ResolveNowOption
# github.com/coreos/etcd/clientv3/balancer/picker
go/pkg/mod/github.com/coreos/etcd@v3.3.26+incompatible/clientv3/balancer/picker/err.go:37:44: undefined: balancer.PickOptions
go/pkg/mod/github.com/coreos/etcd@v3.3.26+incompatible/clientv3/balancer/picker/roundrobin_balanced.go:55:54: undefined: balancer.PickOptions