bullet: The following variables are used in this project, but they are set to NOTFOUND: OPENCL_LIBRARY

[ryandesign@…]

Installing bullet fails on Leopard:

:info:configure CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
:info:configure Please set them or make sure they are set and tested correctly in the CMake files:
:info:configure OPENCL_LIBRARY
:info:configure     linked by target "AppParticlesOCL_Apple" in directory /opt/local/var/macports/build/_Users_rschmidt_macports_dports_devel_bullet/bullet/work/bullet-2.80-rev2527/Demos/ParticlesOpenCL/Apple
:info:configure     linked by target "AppOpenCLClothDemo_Apple" in directory /opt/local/var/macports/build/_Users_rschmidt_macports_dports_devel_bullet/bullet/work/bullet-2.80-rev2527/Demos/OpenCLClothDemo/Apple
:info:configure     linked by target "AppVectorAdd_Apple" in directory /opt/local/var/macports/build/_Users_rschmidt_macports_dports_devel_bullet/bullet/work/bullet-2.80-rev2527/Demos/VectorAdd_OpenCL/Apple
:info:configure 
:info:configure -- Configuring incomplete, errors occurred!

As I recall, OpenCL is a feature Apple added in Snow Leopard. If bullet requires OpenCL now, then it should fail more gracefully on Leopard and Tiger. Or if it can be made to compile without OpenCL, it should do that on Leopard and Tiger. The failures appear to only be in demos; perhaps those demos can simply be skipped on Leopard and Tiger.