glider @0.16.1: cannot find package "net/netip" in any of

[ryandesign (Ryan Carsten Schmidt)]

​https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/185106/steps/install-port/logs/stdio

proxy/direct.go:7:2: cannot find package "net/netip" in any of:
	/opt/local/lib/go/src/net/netip (from $GOROOT)
	/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_net_glider/glider/work/gopath/src/net/netip (from $GOPATH)
Command failed:  cd "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_net_glider/glider/work/gopath/src/github.com/nadoo/glider" && /opt/local/bin/go build 
Exit code: 1