10.4.3 might be required for those versions of GEM. 

On 9/12/06, vincent rioux <vincent.rioux@no-log.org > wrote:
hi,

i recently found that i could not get a Gem release with pix_mean_color
included, to work on ibook G4 (os10.4.2) machines.
for example the latest version of Hans C.S. or Tigital gives the
following error :
symbol not found : _glFramebufferRenderbufferEXT

??
vincent


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