Dear Bioconductor, I am student at University of NewHaven,CT,USA and i found your email in to newcastle.edu message board. http://tolstoy.newcastle.edu.au/R/help/04/05/0486.html I am installing R 1.9.latest on AMD 64 running Fedora 2 from remote shell. I have root access. when I downloaded R-1.9.*.tgz and unpack it and run ./coinfigure it ran nice after doing simple change the line in src/modules/X11/dataentry.c: > /* don't use X11 function prototypes (which tend to ...): */ > #define NeedFunctionPrototypes 0 to > #define NeedFunctionPrototypes 1 and then i did : "make" it went fine. after that I did "make check" it gave me below error: running code in 'tcltk-Ex.R' ...X11 connection rejected because of wrong authentication. make[4]: *** [tcltk-Ex.Rout] Error 1 Could you please help me doing this. I highly appreciate your help in this, Thank you so much, Saurin Jani