便携式R中的tcltk

我正在使用便携式R ，我想尝试一下sqldf包，我可以加载sqldf程序包，但运行sql语句并显示以下消息:

I am using portable R and I want to try the sqldf package a bit, I can load the sqldf package, but running a sql statement and gives me this message:

> sqldf("select * from BOD where Time > 4")
Loading required package: tcltk
Loading Tcl/Tk interface ...Error : .onLoad failed in loadNamespace() for 'tcltk', details:
  call: NULL
  error: Tcl/Tk support files were not installed
Error: require(tcltk) is not TRUE

我一直在寻找解决方案，但是大多数建议我安装R，这是不可能的，因为我使用的是便携式R.

I have looked for solutions but most of them suggest me to install R, which is not possible as I am using portable R.

我该怎么办?谢谢.