If you are having problems making bulldozer run, you should also consult the Installation Troubleshooting section in the Installation chapter of the manual.
This problem indicates that the LD_LIBRARY_PATH was not correctly setup as described in the Installation Tutorials section. This library is distributed with the DIRSIG in the $DIRSIG_HOME/lib directory. Make sure that this library directory appears before all others in the LD_LIBRARY_PATH.
GLX is the X-Windows extension for OpenGL which is a 3D graphics rendering engine. This error will occur if you are trying to run bulldozer on an older UNIX workstation or through an PC/Windows X-Windows emulator (e.g. eXceed, X-win, cygwin, etc.) and the display does not support the OpenGL extension which would provide hardware acceleration for the 3D rendering that bulldozer performs. On a PC/Windows machine using an X-Windows emulator, it is possible that the computer display supports OpenGL for native programs but that the X-Windows emulator does not support OpenGL for applications running on a remote machine.
To resolve this problem, you will need to use a software emulator for the OpenGL extension. The most common software emulator for OpenGL is a library called Mesa which is available at http://www.mesa3d.org. At this site, you can download this library and compile it for your platform. For some of the machines that RIT distributes DIRSIG for, a compiled version of this library is included in a subdirectory within the $DIRSIG_HOME/lib directory. To use it, simply add the Mesa library subdirectory to the front of your LD_LIBRARY_PATH.
Keep in mind that the OpenGL software emulator will be significantly slower than hardware acceleration provided by a modern video card. If your machine does not have a video card that supports hardware acceleration of OpenGL and you plan on using bulldozer, you should consider upgrading your video card.