32 bit dri drivers cannot find libdricore and libglsl

This bug was fixed in the package mesa - 7.10.2-0ubuntu1

---------------
mesa (7.10.2-0ubuntu1) natty; urgency=low

  [ Steve Langasek ]
  * Fix alternatives removal on removal of libgl1-mesa-{swx11,glx}: the
    files are in /usr/lib/mesa, not /usr/lib/GL.
  * The architecture we're building for is DEB_HOST_ARCH, not
    DEB_BUILD_ARCH.

  [ Christopher James Halse Rogers ]
  * New upstream bugfix release.
    - Contains fix for KWin crash when enabling effects on r600 (LP: #738687)
  * debian/patches/105_use_shared_libdricore.patch: Fix rpath for i386
    libraries installed on amd64 via ia32-libs. (LP: #755720)
 -- Christopher James Halse Rogers <email address hidden> Mon, 11 Apr 2011 10:10:35 +1000

ia32-libs will still need an update to pick up the newer mesa upload to fix this problem, or else there will be no hardware 3D support for 32 bit apps on amd64 (as used by adobe flash and wine) using open source drivers.

candrews@complex:~$ ldd /usr/lib32/dri/i965_dri.so
 linux-gate.so.1 => (0xf76f2000)
 libdricore.so => not found
 libglsl.so => not found
 libdrm.so.2 => /lib32/libdrm.so.2 (0xf7617000)
 libexpat.so.1 => /lib32/libexpat.so.1 (0xf75ed000)
 libpthread.so.0 => /lib32/libpthread.so.0 (0xf75d4000)
 libdl.so.2 => /lib32/libdl.so.2 (0xf75cf000)
 libdrm_intel.so.1 => /lib32/libdrm_intel.so.1 (0xf75c4000)
 libstdc++.so.6 => /usr/lib32/libstdc++.so.6 (0xf74d9000)
 libm.so.6 => /lib32/libm.so.6 (0xf74b3000)
 libgcc_s.so.1 => /usr/lib32/libgcc_s.so.1 (0xf7497000)
 libc.so.6 => /lib32/libc.so.6 (0xf7339000)
 /lib/ld-linux.so.2 (0xf76f3000)
 librt.so.1 => /lib32/librt.so.1 (0xf7330000)

However...
candrews@complex:~$ locate libdricore.so
/usr/lib/dri/libdricore.so
/usr/lib32/dri/libdricore.so
candrews@complex:~$ locate libglsl.so
/usr/lib/dri/libglsl.so
/usr/lib32/dri/libglsl.so

So those libraries do exist. I don't understand why the loader isn't finding them.

According to:
strace -f ldd /usr/lib32/dri/i965_dri.so 2>&1 | grep lib
(output here: http://pastebin.ca/2047018 )
the loader is looking for libdricore.so and libglsl.so in /lib32, not in /usr/lib32. So a couple symlinks solves the problem:
$ sudo ln -s /usr/lib32/dri/libdricore.so /lib32/libdricore.so
$ sudo ln -s /usr/lib32/dri/libglsl.so /lib32/libglsl.so
$ ldd /usr/lib32/dri/i965_dri.so
 linux-gate.so.1 => (0xf77a0000)
 libdricore.so => /lib32/libdricore.so (0xf74dc000)
 libglsl.so => /lib32/libglsl.so (0xf73eb000)
 libdrm.so.2 => /lib32/libdrm.so.2 (0xf73e1000)
 libexpat.so.1 => /lib32/libexpat.so.1 (0xf73b7000)
 libpthread.so.0 => /lib32/libpthread.so.0 (0xf739e000)
 libdl.so.2 => /lib32/libdl.so.2 (0xf739a000)
 libdrm_intel.so.1 => /lib32/libdrm_intel.so.1 (0xf738e000)
 libstdc++.so.6 => /usr/lib32/libstdc++.so.6 (0xf72a3000)
 libm.so.6 => /lib32/libm.so.6 (0xf727d000)
 libgcc_s.so.1 => /usr/lib32/libgcc_s.so.1 (0xf7261000)
 libc.so.6 => /lib32/libc.so.6 (0xf7104000)
 /lib/ld-linux.so.2 (0xf77a1000)
 librt.so.1 => /lib32/librt.so.1 (0xf70fa000)

This bug was fixed in the package ia32-libs - 20090808ubuntu13

---------------
ia32-libs (20090808ubuntu13) natty; urgency=low

  * Freshen packages (LP: #755720)
  * Remove dummy package libglu1-xorg (libglu1-mesa remains)
 -- Scott Ritchie <email address hidden> Wed, 20 Apr 2011 23:28:04 -0700

The addition of these libraries has made extremely slow and unplayable ​​the videogames with a native client for GNU/Linux, example Neverwinter Nights, on a nVidia card with the Nouveau driver.