To work with the OpenCL™ runtime, an application should link to the OpenCL™ Installable Client Driver (OpenCL™ ICD) presented as the libOpenCL.so file.
The default OpenCL ICD installation directory is /opt/intel/opencl_compilers_and_libraries_18.1.*/linux/compiler/lib/intel64_lin/
Use the OpenCL ICD to select an OpenCL platform for use in your application. If several OpenCL platforms exist in the system, the application should use the clGetPlatformIDs and clGetPlatformInfo functions to query the available OpenCL platforms and to decide which one to use. See section Querying OpenCL™ Platform ID for more information.