I uploaded the whole R 64 for win64 using MINGW64, include the source code, bin and tool-chain. the source code and bin can download at: http://download.cos.name/incoming/r64-src-and-bin-for-win64.zip (attention: the source code may be contain error,you are welcome report bugs to me) the tool-chain can download at: http://download.cos.name/incoming/Rtools64.zip (attention: the gcc included in the tool-chain is a native gcc 4.5.0 for win64(20091231), I download from http://www.equation.com/servlet/equation.cmd?fa=fortran and I think it's free and GPLed,so we can use it,and if you have any question about gcc ,pls write a mail to the webmaster of equation.com ) best wishs. Gong Yu 2010/1/6