Trying to install XML package as many of you have kindly told me, i get others error: is the first time I experience such a lot of problems.... maybe a not well done R installation?? or simply a dependencies problem? > install.packages2("XML") Note: You did not specify a download type. Using a default value of: Source This will be fine for almost all users [1] "Attempting to download XML from http://www.bioconductor.org//CRANrepository" [1] "Download complete." [1] "Installing XML" * Installing *source* package 'XML' ... checking for gcc... gcc checking for C compiler default output... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ANSI C... none needed checking how to run the C preprocessor... gcc -E checking for xml-config... no checking for xml2-config... no Cannot find xml2-config ERROR: configuration failed for package 'XML' >From URL: http://www.bioconductor.org//CRANrepository XML version 0.95-6 Warning message: Installation of package XML had non-zero exit status in: installPkg(fileName, pkg, pkgVer, type, lib, repEntry, versForce) THANKS a LOT ed -- "Raffiniert ist der Herr Gott, aber boshaft ist Er nicht." --- Dr. Edoardo Saccenti FiorGen Pharmacogenomics Foundation CERM Nuclear Magnetic Resonace Research Center Scientific Pole - University of Florence Via Luigi Sacconi n? 6 50019 Sesto Fiorentino (FI) tel: +39 055 4574193 fax: +39 055 4574253 saccenti@cerm.unifi.it www.cerm.unifi.it