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);
        }
}

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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();

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Can you provide a minimal complete compilable example?