In file included from libavfilter/opencl.h:31:0,
                 from libavfilter/opencl.c:26:
./libavutil/hwcontext_opencl.h:25:10: fatal error: CL/cl.h: No such file or directory
 #include 
          ^~~~~~~~~
compilation terminated.
make: *** [libavfilter/opencl.o] Error 1
make: *** Waiting for unfinished jobs....