Dear all, Want to update to 2.6 on a RedHat EL4 64 bit system. When the RPM tries to install, I get a message that R2.5.1-dev is necessary. I don't have 2.5.1-dev installed so the 2.6 install quits. I couldn't find 2.5.1-dev at CRAN so I'm stuck. Any help would be appreciated. Thanks in advance, Dennis Burian, Ph.D. Functional Genomics Group Civil Aerospace Medical Institute, AAM-610 6500 S. MacArthur Blvd. Oklahoma City OK 73169 405-954-6087 dennis.burian at faa.gov