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...lled R. Next, in R, I set the TCL_LIBRARY variable by saying Sys.setenv(TCL_LIBRARY="/usr/local/lib/tcl8.5") and Sys.setenv(TK_LIBRARY="/usr/local/lib/tk8.5") But still when I try to run any GUI-based program, it gives me the error that TCL/TK were not istalled. In tclRequire(tclPkg) : Tcl package 'BWidget' not found I have a suspicion that I am not setting the TCL_LIBRARY right. When I try to set the TCL_VARIABLE to /usr/bin even then it does not work. What am I doing wrong? Please help. Thanks, Nitin -- ΝI+IИ [[alternative HTML version deleted]]