SimTk/openmm — pull request #436 by jchodera (2014-05-04 18:01:06+00:00)
Title: Fixes to CMake build to turn off OpenCL build on OS X platforms and properly set CMAKE_OSX_SYSROOT

This PR has two changes:
* OpenCL is disabled by default on all OS X platforms
* I got tired of having to set `CMAKE_OSX_SYSROOT` manually every time I check out OpenMM, so this is now set automatically based on the OS X 10.y version number y. The 10.7 SDK path should probably be checked.