private Source userToolchainsSource;

    @Override
    public Source getGlobalToolchainsSource() {
        return globalToolchainsSource;
    }

    @Override
    public ToolchainsBuildingRequest setGlobalToolchainsSource(Source globalToolchainsSource) {
        this.globalToolchainsSource = globalToolchainsSource;
        return this;
    }

    @Override
    public Source getUserToolchainsSource() {

     *
     * @param globalToolchainsSource The global toolchains source, may be {@code null} to disable global toolchains.
     * @return This request, never {@code null}.
     */
    ToolchainsBuildingRequest setGlobalToolchainsSource(Source globalToolchainsSource);

    /**
     * Gets the user toolchains source.
     *
     * @return The user toolchains source or {@code null} if none.
     */
    Source getUserToolchainsSource();