libgl1-mesa-swx11-i686 7.1-1ubuntu1 (i386 binary) in ubuntu intrepid

 Mesa is a 3-D graphics library with an API which is very similar to
 that of OpenGL. To the extent that Mesa utilizes the OpenGL command
 syntax or state machine, it is being used with authorization from
 Silicon Graphics, Inc. However, the author makes no claim that Mesa
 is in any way a compatible replacement for OpenGL or associated with
 Silicon Graphics, Inc.
 .
 This library provides a pure software rasteriser; it does not provide
 a direct rendering-capable library, or one which uses GLX. For that,
 please see libgl1-mesa-glx.
 .
 On Linux, this library is also known as libGL or libGL.so.1.
 .
 This set of libraries is optimized for i686 machines and will only be used if
 you are running a 2.6 kernel on an i686 class CPU. This includes Pentium Pro,
 Pentium II/II/IV, Celeron CPU's and similar class CPU's (including clones
 such as AMD Athlon/Opteron, VIA C3 Nehemiah, but not VIA C3 Ezla).