WireGuard build output

gistfile1.txt

root@it01:/usr/local/src/wireguard-go# make
go build -v -o "wireguard-go"
Fetching https://golang.org/x/text?go-get=1
Fetching https://golang.org/x/sys?go-get=1
Fetching https://golang.org/x/net?go-get=1
Fetching https://golang.org/x/crypto?go-get=1
Parsing meta tags from https://golang.org/x/crypto?go-get=1 (status code 200)
get "golang.org/x/crypto": found meta tag get.metaImport{Prefix:"golang.org/x/crypto", VCS:"git", RepoRoot:"https://go.googlesource.com/crypto"} at https://golang.org/x/crypto?go-get=1
Parsing meta tags from https://golang.org/x/text?go-get=1 (status code 200)
get "golang.org/x/text": found meta tag get.metaImport{Prefix:"golang.org/x/text", VCS:"git", RepoRoot:"https://go.googlesource.com/text"} at https://golang.org/x/text?go-get=1
Parsing meta tags from https://golang.org/x/sys?go-get=1 (status code 200)
get "golang.org/x/sys": found meta tag get.metaImport{Prefix:"golang.org/x/sys", VCS:"git", RepoRoot:"https://go.googlesource.com/sys"} at https://golang.org/x/sys?go-get=1
Parsing meta tags from https://golang.org/x/net?go-get=1 (status code 200)
get "golang.org/x/net": found meta tag get.metaImport{Prefix:"golang.org/x/net", VCS:"git", RepoRoot:"https://go.googlesource.com/net"} at https://golang.org/x/net?go-get=1
go: finding golang.org/x/text v0.3.2
go: finding golang.org/x/sys v0.0.0-20191003212358-c178f38b412c
go: finding golang.org/x/net v0.0.0-20191003171128-d98b1b443823
go: finding golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc
go: finding golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3
go: finding golang.org/x/sys v0.0.0-20190412213103-97732733099d
Fetching https://golang.org/x/tools?go-get=1
Parsing meta tags from https://golang.org/x/tools?go-get=1 (status code 200)
get "golang.org/x/tools": found meta tag get.metaImport{Prefix:"golang.org/x/tools", VCS:"git", RepoRoot:"https://go.googlesource.com/tools"} at https://golang.org/x/tools?go-get=1
go: finding golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e
go: finding golang.org/x/text v0.3.0
go: finding golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a
go: finding golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2
go: downloading golang.org/x/net v0.0.0-20191003171128-d98b1b443823
go: downloading golang.org/x/sys v0.0.0-20191003212358-c178f38b412c
go: downloading golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc
go: extracting golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc
go: extracting golang.org/x/net v0.0.0-20191003171128-d98b1b443823
go: extracting golang.org/x/sys v0.0.0-20191003212358-c178f38b412c
golang.org/x/sys/cpu
golang.org/x/crypto/blake2s
golang.org/x/crypto/internal/subtle
golang.org/x/crypto/internal/chacha20
golang.org/x/crypto/poly1305
golang.org/x/crypto/chacha20poly1305
golang.org/x/crypto/curve25519
golang.org/x/net/bpf
golang.org/x/net/internal/iana
golang.org/x/sys/unix
golang.org/x/net/internal/socket
golang.org/x/net/ipv4
golang.org/x/net/ipv6
golang.zx2c4.com/wireguard/rwcancel
golang.zx2c4.com/wireguard/ipc
golang.zx2c4.com/wireguard/ratelimiter
golang.zx2c4.com/wireguard/replay
golang.zx2c4.com/wireguard/tai64n
golang.zx2c4.com/wireguard/tun
golang.zx2c4.com/wireguard/device
# golang.zx2c4.com/wireguard/device
device/conn_linux.go:49:7: undefined: sync.Lock
make[1]: *** [Makefile:20: wireguard-go] Error 2
make: *** [Makefile:12: generate-version-and-build] Error 2