Description of problem:
Currently compiled and RPM packaged in RHEL 8 and RHEL 9 Motif libraries have the problem of LONG_BIT not being defined.
For instance /lib64/libXm.so is a 64-bit shared library but it seems not to be built with LONG_BIT == 64.

The problem is with Motif code (upstream) actually.

Even with "#include <limits.h>" added, LONG_BIT is still not defined *unless* you add -D_XOPEN_SOURCE to the build command line.

But if you do so, the build fails because caddr_t (an old BSD'ism) is not defined. So to build properly, we need two things:

1. Define _XOPEN_SOURCE where LONG_BIT is used
2. Replace caddr_t 

Version-Release number of selected component (if applicable):

Motif-library (/lib64/libXm.so.4.0.4)
In motif-2.3.4-16.el8.x86_64.rpm etc.

How reproducible:

Always

Steps to Reproduce:

The error message on RHEL 7 and 8 was: _XtGetStringValues: bad size 8
Tracing it back in the Motif source we found::
static void _XtGetStringValues(Widget w, Arg *warg, int numargs)
{
    ...
    switch (res->resource_size)
    {
        case 1:
        ...
        case 2:
        ...
        case 4:
        ...
#if (LONG_BIT == 64)
        case 8:
        ...
#endif
        default:
           fprintf(stderr, "_XtGetStringValues: bad size %d\n", res->resource_size);
            string = "bad size";
            ...
    }
}


Expected results:

Libraries to be compiled with LONG_BIT set to 64.

Additional info:

Customer Case NR: 03305642
SO discussion: https://stackoverflow.com/questions/15817380/long-bit-in-limits-h