I'm trying to install widgetTools (because genefilter requires it) and it says that Tcl wasn't installed properly, but I have Tcl installed and I've even tried telling R where it is: R CMD INSTALL --configure-args="--with-tcl- include=/sw/include/tcl8.4 --with-tcl-lib=/sw/lib/tcl8.4" -l ~/Library/R/library ~/Desktop/widgetTools But it doesn't work. Here is the stuff from R: > library(widgetTools) Loading required package: tcltk Error in fun(...) : Can't find a usable init.tcl in the following directories: /usr/local/lib/tcl8.4 /usr/local/lib/tcl8.4 This probably means that Tcl wasn't installed properly. Error: .onLoad failed in loadNamespace for 'tcltk' Error in fun(...) : Package tcltk not able to be loaded! Error: .onLoad failed in loadNamespace for 'widgetTools' Error in library(widgetTools) : package/namespace load failed for 'widgetTools' Matt