*** For details on how to be removed from this list visit the *** *** CCP4 home page http://www.dl.ac.uk/CCP/CCP4/main.html *** Do you have XFree86-devel installed? try: rpm -q XFree86-devel This provides the libXt file that you need, at least on my RH7 system. For installing CCP4 is is advisable to use the 'everything' option on a RedHat install.