'MAILBOX_CLIENT_DATA_VALID' undeclared (first use in this function); did you mean 'MAILBOX_CLIENT_READ_VALID'? - 'MAILBOX_CLIENT_DATA_VALID' undeclared (first use in this function); did you mean 'MAILBOX_CLIENT_READ_VALID'? Description This error may be seen in Intel® Quartus® Prime Pro Edition Software version 21.1 during MicroC/OS-II compilation when a design is instantiated with the Mailbox Client Intel® FPGA IP in Intel® Stratix® 10 and all Intel Agilex® devices. This is because there is a naming mismatch with the Mailbox Client Interrupt MicroC/OS-II flag. Resolution To avoid this error, change MAILBOX_CLIENT_DATA_VALID to MAILBOX_CLIENT_READ_VALID in altera_s10_mailbox_client.c; line 32. This problem is fixed starting with the Intel® Quartus® Prime Pro Edition Software version 21.2. Custom Fields values: ['novalue'] Troubleshooting 1508916622 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 21.2 21.1 ['Agilex™ 7 FPGAs and SoCs', 'Stratix® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']