__UINT_LEAST8_MAX__ and HP-UX 11.23/IA

In data/skeletons/c.m4 from bison-3.7.4, we have:
  #if defined __UINT_LEAST8_MAX__ && __UINT_LEAST8_MAX__ <= __INT_MAX__
  typedef __UINT_LEAST8_TYPE__ yytype_uint8;
  #elif (!defined __UINT_LEAST8_MAX__ && defined YY_STDINT_H \
         && UINT_LEAST8_MAX <= INT_MAX)
  typedef uint_least8_t yytype_uint8;
  #elif !defined __UINT_LEAST8_MAX__ && UCHAR_MAX <= INT_MAX
  typedef unsigned char yytype_uint8;
  #else
  typedef short yytype_uint8;
  #endif

Unfortunately, on HP-UX 11.23/IA, UINT_LEAST8_MAX evaluates to
((unsigned char)(255)) causing a problem with:
  #elif (!defined __UINT_LEAST8_MAX__ && defined YY_STDINT_H \
         && UINT_LEAST8_MAX <= INT_MAX)

While building sudo-1.9.5p1 which uses bison-3.7.2, we get errors
like:
  "gram.c", line 510: error #2018: expected a ")"
           && UINT_LEAST8_MAX <= INT_MAX)
              ^

  "gram.c", line 510: error #2059: function call is not allowed in a constant
            expression
           && UINT_LEAST8_MAX <= INT_MAX)
              ^

So, what's the best way to solve this?

-- 
albert chin ([email protected])