我正在尝试创建一个包，编译它并在OpenWrt中安装它。但是，我无法解决此错误：
Makefile:635: *** missing separator (did you mean TAB instead of 8 spaces?). Stop.
这是Makefile中的第635行：
define Package/qt4-drivers-gfx-vnc/install
$(INSTALL_DIR) \
$(1)/usr/lib/Qt/plugins/gfxdrivers
$(CP) \
$(PKG_INSTALL_DIR)/usr/lib/Qt/plugins/gfxdrivers/libqgfxvnc.so \
$(1)/usr/lib/Qt/plugins/gfxdrivers/
endef
$(eval $(call BuildPackage,qt4)) /*this is the line 635*/
$(eval $(call BuildPackage,qt4-gui))
$(eval $(call BuildPackage,qt4-demos))
$(eval $(call BuildPackage,qt4-examples))
$(eval $(call BuildPackage,qt4-network))
$(eval $(call BuildPackage,qt4-sqlite))
$(eval $(call BuildPackage,qt4-mysql))
$(eval $(call BuildPackage,qt4-openssl))