Hello... I have been trying to get the XML and MAGEML packages from Bioconductor to run on Mac OS X. When I use the call getBioC("analyses"), when it comes to the XML package I get the following output. [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' ** Removing '/Applications/StartR.app/RAqua.app/Contents/library/XML' Warning message: Installation of package XML had non-zero exit status in: installPkg(fileName, pkg, pkgVer, type, lib, repEntry, versForce) Does anyone know what I need to do to get xml2-config set up? Or is that really the problem? Thank you very much for your help. Jeffrey Leek Graduate Student University of Washington Department of Biostatistics jtleek@u.washington.edu