AcquireMagickOpenCLEnv  516 magick/opencl.c       defaultCLEnv = AcquireMagickOpenCLEnv();
AcquireMagickOpenCLEnv 2329 magick/opencl.c   clEnv=AcquireMagickOpenCLEnv();
AcquireMagickOpenCLEnv   62 magick/opencl.h   AcquireMagickOpenCLEnv(),