   Relief mapping example - vertex & fragment shaders failed to link
  Greetings, I am having some trouble with the following example from codesampler.comhttp://www.codesampler.com/source_users/oglu_glslang_relief_mapping.zipIt compiles alright but...I get a vertex & fragment shaders failed to link message , I do not get this message on my laptop (x700 radeon winxp sp3) but its so slow my system clogs, how ever on my pc (x2 5000, radeon 4670 xp sp2, latest drivers)I get this linking error.any ideas why ?, I googled a bit and there was mention of a problem with a GL variable type   
  You get a linker error.   