Those who are having trouble with GLSL, are you on the most recent
version of OCIO?

I made a commit last week (which is in version 0.7.5), where on OSX
the const keyword would be omitted for GLSL 1.0 (which is what should
be used on OSX).

If you see line 79 in
http://github.com/imageworks/OpenColorIO/blob/master/src/core/Processor.cpp

And I confirmed that the ociodisplay app works on my osx 10.6.6
install. (A macbook laptop).

You'll see that in OCIO we currently distinguish the profile options
between GLSL 1.0, 1.3, and GG. And that only the CG and GLSL 1.3+
profiles use the const identifier. My hope was that we could get by
with the minimum language options necessary, and only add new glsl
versions if/when new language features are necessary.

-- Jeremy