PyOpenGL: I recently came across the following error while building PyOGL on RH9.0 under both Python 2.2 and 2.3.2 warning: error while loading Togl.so: can't find package Tk 8.1 'setup.py build' worked fine, I only saw this error upon running 'setup.py install'. I'm running Tk8.3, so I don't know why it's looking for 8.1. I've built PyOGL on Mac OS X/fink and RH8.0 and have never before seen this problem. I googled the error and found a couple of other occurances of this error (e.g. here), but no suggested work arounds.

Got a response to this from Mike Fletcher, who referred me to this web page, where Craig Kaplan posts the following:

 
 One of your brave fellow students provided her laptop in what 
 proved to be a successful PyOpenGL linux building experience. 
 Here are some simple instructions.  They should work for, say, 
 RedHat 8/9 and Python 2.2 or 2.3.  I'll assume you're using 
 Python2.2 for these instructions -- the substitutions for 2.3 
 should be obvious. 
  
   1. tar xzvf PyOpenGL-2.0.1.07.tar.gz 
      cd PyOpenGL-2.0.1.07 
      python setup.py install 
  
 At this point we'll get to that mysterious "can't find Tcl 8.1" 
 error that some of you have experienced.  But a lot of the 
 files we need have already been installed. 
  
   4. Edit the file "setup/togl_setup.py".  Look for the lines 
  
       # make package index for tcl/tk 
       if not dry_run: 
  
      Change "if not dry_run:" to "if 0:" to disable the block of 
      code that follows. 
  
   5. Edit the file 
      "/usr/lib/python2.2/site-packages/OpenGL/Tk/linux2-tk8.3/pkgIndex.tcl" 
      (the name may be slightly different for you).  Add the following lines 
      to the end of it: 
  
 ------------ CUT HERE -------------- 
 if {![package vsatisfies [package provide Tcl] 8]} {return} 
 package ifneeded Togl 1.6.0 \ 
      [list load [file join $dir Togl.so] Togl] 
 ------------ CUT HERE -------------- 
  
   6. Go back to the PyOpenGL-2.0.1.07 directory and re-run 
      "python setup.py install".  This time the installation should 
      run until the end. 
  
   7. Don't try to test that it works from within the PyOpenGL 
      source directory -- it fails for some reason.  Switch to 
      a different directory and try "from OpenGL.Tk import *" 
      from within a Python session.  You shouldn't get any errors, 
      and a small window should appear on the screen.