Operating system RedHat Linux 7.1 (SeaWolf) with kernel 220.127.116.11. (However, due to problems in installation with the NFS daemon the server runs the 2.2.16 kernel (corresponding to RH 7.0)). See InstallationNotes
Installation on Red Hat 7.1: opendx needs the Motif library. Under Linux there are two free versions of Motif: Lesstif and Openmotif. I had problems with Opendx and Lesstif, so that I suggest to install openmotif-2.1.30-6 rpm and then opendx-4.2.0-1 and opendx-samples-4.2.0-1 rpm's.