setNoOpt()
	goldflags = os.Getenv("GO_LDFLAGS") // we were using $BOOT_GO_LDFLAGS until now
	goBootstrap := pathf("%s/go_bootstrap", tooldir)
	if debug {
		run("", ShowOutput|CheckExit, pathf("%s/compile", tooldir), "-V=full")
		copyfile(pathf("%s/compile1", tooldir), pathf("%s/compile", tooldir), writeExec)
	}

	// To recap, so far we have built the new toolchain
	// (cmd/asm, cmd/cgo, cmd/compile, cmd/link)

	}
	if n >= 1 && (knownOS[l[n-1]] || knownArch[l[n-1]]) {
		return ctxt.matchTag(l[n-1], allTags)
	}
	return true
}

// ToolDir is the directory containing build tools.
var ToolDir = getToolDir()

// IsLocalImport reports whether the import path is
// a local import path, like ".", "..", "./foo", or "../foo".
func IsLocalImport(path string) bool {