as the title says, the OpenGL module (openGL.mm in JuceLibraryCode) fails to compile with the base SDK set to 10.5. The errors are about gllRenderBuffer, glBindRenderBuffer and the like as well as missing definitions like GL_FRAMEBUFFER. (latest tip, XCode 3.2.6 on Snow Leopard)
I tried this by creating an empty audio plugin with the IntroJucer setting Base and Compatibility SDK to 10.5. Compiling with 10.6/10.5 base/compatibility SDK isn’t an option as the plugin won’t run on 10.5 (I only tried AU/VST of the current JuceDemoPlugin, where AU crashes Reaper while the VST works; didn’t test 64-bit or RTAS).