• FreeBSD
• clang / gcc

When attempting to compile a C program (probably one you downloaded from the internet), in either clang or gcc, you encounter an error similar to this one:

myprogram.c:600:2: error: use of undeclared identifier 'uint'; did you mean 'int'?
        uint n=0;
        ^~~~
        int

uint is not a standard C data type, however it is used by other platforms, such as Linux.

To resolve this issue, declare the uint type before main in the C source file, for example:

typedef	__uint32_t	uint;  

The program should then compile.