> Yes, Chris is right about the different ABIs.  (A "man ABI" will tell
> you more.)
>
> However, the o32 ABI is somewhat deprecated, unless you really need to
> support backward compatibility to old systems and/or old IRIX versions.
> It turns out that all three ABIs are supported by the CAVE distribution:
> The "lib" subdirectory has the o32 versions, the "lib32" directory has
> the n32 versions, and the "lib64" directory has the n64 versions.  So
> you actually have libraries for whichever ABI you want to use.  (On the
> O2000, n64 would probably make the most sense.)
> 
> I do note, though, that although two of the libraries (libcave_ogl.a and
> libpfcave_ogl.a) exist in all three directories, there are two (libcave.a
> and libpfcave_igl.a) which exist only in the "lib" directory.