The xemacs included with RH5.2 is linked against
libpng.so.0, which is not included, nor (apparently) listed
as a dependency.

% ldd /usr/bin/xemacs
        libXaw.so.6 => /usr/X11R6/lib/libXaw.so.6
(0x40007000)
        libpng.so.0 => not found
        libjpeg.so.6 => /usr/lib/libjpeg.so.6 (0x4003c000)
...
% xemacs
xemacs: error in loading shared libraries
libpng.so.0: cannot open shared object file: No such file or
directory
...
% locate libpng.so
/usr/lib/libpng.so
/usr/lib/libpng.so.2
/usr/lib/libpng.so.2.1.0