Figured out how to build OpenCL and for what its worth the agilekeychain supports OpenCL in JTR.
Benchmark
./john -t=60 --format=agilekeychain-opencl
OpenCL platform 0: AMD Accelerated Parallel Processing, 2 device(s).
Device 0: Juniper (AMD Radeon HD 6700 Series)
Local worksize (LWS) 64, Global worksize (GWS) 9216
Benchmarking: 1Password Agile Keychain PBKDF2-HMAC-SHA-1 AES [OpenCL]... DONE
Raw: 64047 c/s real, 131326 c/s virtual
Benchmark
./john -t=60 --format=agilekeychain-opencl
OpenCL platform 0: AMD Accelerated Parallel Processing, 2 device(s).
Device 0: Juniper (AMD Radeon HD 6700 Series)
Local worksize (LWS) 64, Global worksize (GWS) 9216
Benchmarking: 1Password Agile Keychain PBKDF2-HMAC-SHA-1 AES [OpenCL]... DONE
Raw: 64047 c/s real, 131326 c/s virtual