There are two ways to import a Go package in Go+ programs.

The first way is importing it directly, as a Go+ package (but this way is not implemented currently). The reason it works is because a Go package is also a legal Go+ package. It is very easy, but has some limits. It doesn't work if the Go package to be imported uses cgo.

The second way is static link it into the gop command (In alpha stage, we use the qgo, qrun commands).

cd $GoPlusRoot
qexp <goPkgPathToImport>
cd lib/default.go
vim lib/default.go
# add github.com/goplus/gop/lib/<goPkgPathToImport> and save
go install -v ./...

Now, you can import it in a Go+ program:

import "<goPkgPathToImport>"

...