Nios 2 uart initialization problem

I have been playing around with this more and have tried to open the uart in this way:

int fd;

fd = open(UART_0_NAME, O_RDWR);

This generates two errors:

Description Resource Path Location Type
conflicting types for 'fopen'; have 'FILE *(int, const char *)' UserFlashTest line 339, external location: /home/user/apps/intelFPGA_lite/22.1std/nios2eds/bin/gnu/H-x86_64-pc-linux-gnu/nios2-elf/include/stdio.h C/C++ Problem
initializer element is not constant UserFlash.c /UserFlashTest line 861 C/C++ Problem

Functions that call read and write with fd don't generate errors. I think if I could get past the open call, I would be good. Any suggestions as what might be wrong?

Regards,

Kelly Painter