warning: type defaults to `int' in declaration of `s'??

Hi,
Does anyone know why gcc would give me this error on the line in red?
warning: type defaults to `int' in declaration of `s'

Code:

if ( in_file != (char *) NULL ) {
	char *s;

	if (! chk_suffix( in_file, ".rpc" ) )
		errorf( 413, "invalid input file name %s", in_file );
		
	s = mod_name( in_file, ".rpc", ".h", STRIPDIR );
	header = STRCPY(s);
	if ( source == (char *) NULL ) {
		s = mod_name( in_file, ".rpc", ".c", STRIPDIR );
		source = STRCPY(s);
	}
}

s is obviously declared as a char* a few lines above it...
mod_name() returns a char*.

Probably barking up the wrong tree, but is mod_name() properly declared and defined to return a char *?

Other than that, it looks right to me.

It's defined as:

Code:

extern char *mod_name();

Can you provide a minimal complete compilable example?