Looking at the file in question, it appears that all the errors are stemming from function signatures (in which multiple arguments have the same dummy argument name).
My C is a little rusty, but as I remember, you can omit the dummy argument names on declarations. This would give you (lines 63-80):

...

#if defined(_STDC_C99) || \
    (!defined(_STRICT_STDC) && !defined(__XOPEN_OR_POSIX)) || \
    defined(_XPG6) || defined(__EXTENSIONS__)
extern int vfwscanf(__FILE *, const wchar_t *,
        __va_list);
extern int vswscanf(const wchar_t *,
        const wchar_t *, __va_list);
extern int vwscanf(const wchar_t *, __va_list);
extern float wcstof(const wchar_t *,
        wchar_t **);
#if defined(_LONGLONG_TYPE)
extern long double wcstold(const wchar_t *,
        wchar_t **);
extern long long wcstoll(const wchar_t *,
        wchar_t **, int);
extern unsigned long long wcstoull(const wchar_t *,
        wchar_t **, int);
#endif /* defined(_LONGLONG_TYPE) */
...
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