error: function 'write_channel_altera' is not supported by the Intel(R) FPGA SDK for OpenCL(TM), and no user definition is provided - error: function 'write_channel_altera' is not supported by the Intel(R) FPGA SDK for OpenCL(TM), and no user definition is provided Description You may see this error when compiling an Intel® OpenCL kernel file ( *.cl ) which uses “ altera ” as its function name. Resolution Open the kernel file name in a text editor and replace all instances of the “ altera ” name with “ intel ” for example: from: write_channel_altera to: write_channel_intel Custom Fields values: ['novalue'] Troubleshooting FB: 444750; False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 16.0 ['Programmable Logic Devices'] ['HLD Tools OpenCL'] ['novalue'] ['novalue']