With go1.26rc2, I got this error:
go install github.com/xtaci/qsh@main
go: downloading github.com/xtaci/qsh v0.0.0-20251229130544-81637fe9d6a1
go: downloading github.com/xtaci/hppk v1.1.4
go: downloading github.com/xtaci/qpp v1.1.24
# github.com/xtaci/qsh
..\..\..\..\go\pkg\mod\github.com\xtaci\qsh@v0.0.0-20251229130544-81637fe9d6a1\registry.go:113:31: undefined: syscall.SIGUSR1
..\..\..\..\go\pkg\mod\github.com\xtaci\qsh@v0.0.0-20251229130544-81637fe9d6a1\tty.go:85:31: undefined: syscall.SIGWINCH
With go1.26rc2, I got this error: