BX 6 does not work with lesstif (an Open Motif clone). If you try to run BX 6, and only have lesstif installed (or your shared library path is set so that the lesstif library is found first), you will get an error message complaining about the undefined routine xmSimpleSpinBoxWidgetClass. The solution to this is to install Open Motif. (See previous question for discussion of Open Motif compatibility.) The following provides the links to URLs for both the

Runtime RPMs
http://www.rpmfind.net/linux/rpm2html/search.php?query=openmotif&submit=...

Development RPMs
http://www.rpmfind.net/linux/rpm2html/search.php?query=openmotif-devel&s...
First install the runtime RPM, and then install the development kit.