Hi, I'm slightly confused as to which location is the released version of the software collections and devtoolset. (a) There are those under: http://ftp2.scientificlinux.org/linux/scientific/6.4/x86_64/external_products/ (and similarly for 6x). (b) But there is also: http://linuxsoft.cern.ch/cern/devtoolset/ http://linuxsoft.cern.ch/cern/scl/ (b) contains devtoolset-2, which (a) doesn't. Which is the "supported" repository ? Cheers, Jonathan.