[R] Configuring R-2.5.0 for X11 on Red Hat WS 4 x86-64

I have been unable to configure R-2.5.0 for the X11 interface on Red Hat WS 4 x86-64 (AMD Opteron). The configure script looks for XtToolkitInitialize in libXt, and does not find it because it's not in libXt (which is present, however). I tried installing openmotif and openmotif-devel, and that

[R] R 2.1.0 RH Linux Built from Source Segmentation Fault

Background: I administer a cluster of RedHat EWS 3U4 Linux workstations at a university. I built R 2.1.0 from source: ./configure \ --prefix=/sscc/opt/R-2.1.0 \ --with-blas=no \ 2>&1 \ | tee NUInstall.configure R is now configured for i686-pc-linux-gnu Source direc