if bp.PkgObj == "" {
			if bp.Goroot && bp.Dir != "" {
				filename, err = lookupGorootExport(bp.Dir)
				if err == nil {
					_, err = os.Stat(filename)
				}
				if err == nil {
					return filename, bp.ImportPath, nil
				}
			}
			goto notfound
		} else {
			noext = strings.TrimSuffix(bp.PkgObj, ".a")
		}
		id = bp.ImportPath