make install gives below errors
cd /usr/ports/lang/go
make install
===> Building for go-1.7.4
Building Go bootstrap tool.
cmd/dist
ERROR: Cannot find /usr/local/go/bootstrap/bin/go.
Set $GOROOT_BOOTSTRAP to a working Go tree >= Go 1.4.
*** Error 1 in . (Makefile:63 'do-build': @cd /usr/ports/pobj/go-1.7.4/go/src && CC="cc" CXX="c++" GOROOT=/usr/ports/pobj/go-1.7.4/go GO...)
*** Error 1 in . (/usr/ports/infrastructure/mk/bsd.port.mk:2683 '/usr/ports/pobj/go-1.7.4/build-amd64/.build_done')
*** Error 1 in . (/usr/ports/infrastructure/mk/bsd.port.mk:1884 '/usr/ports/packages/amd64/all/go-1.7.4.tgz')
*** Error 1 in . (/usr/ports/infrastructure/mk/bsd.port.mk:2409 '_internal-package')
*** Error 1 in . (/usr/ports/infrastructure/mk/bsd.port.mk:2389 'package')
*** Error 1 in . (/usr/ports/infrastructure/mk/bsd.port.mk:1901 '/var/db/pkg/go-1.7.4/+CONTENTS')
*** Error 1 in /home/ports/lang/go (/usr/ports/infrastructure/mk/bsd.port.mk:2389 'install')