out = cgoTypeSigRe.ReplaceAllString(out, "C.")
	}

	// Usually desc is already p.Desc(), but if not, signal cmdError.Error to
	// add a line explicitly mentioning the import path.
	needsPath := importPath != "" && p != nil && desc != p.Desc()

	err := &cmdError{desc, out, importPath, needsPath}
	if cmdErr != nil {
		// The command failed. Report the output up as an error.
		return err
	}