builtin.c:1921:35: warning: shifting a negative signed value is undefined [-Wshift-negative-value]
        static const time_t time_t_min = TYPE_MINIMUM(time_t);
                                         ^~~~~~~~~~~~~~~~~~~~
builtin.c:48:20: note: expanded from macro 'TYPE_MINIMUM'
                              ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
                                ~~~~~~~ ^
builtin.c:1922:35: warning: shifting a negative signed value is undefined [-Wshift-negative-value]
        static const time_t time_t_max = TYPE_MAXIMUM(time_t);
                                         ^~~~~~~~~~~~~~~~~~~~
builtin.c:49:41: note: expanded from macro 'TYPE_MAXIMUM'
#define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
                                        ^~~~~~~~~~~~~~~~
builtin.c:48:20: note: expanded from macro 'TYPE_MINIMUM'
                              ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
                                ~~~~~~~ ^
builtin.c:3836:2: error: use of undeclared identifier 'reslen'
        reslen = t1->stlen;
        ^
builtin.c:3839:33: error: use of undeclared identifier 'reslen'; did you mean 'wcslen'?
        return make_string(the_result, reslen);
                                       ^~~~~~
                                       wcslen
./awk.h:1331:47: note: expanded from macro 'make_string'
#define make_string(s, l)       make_str_node((s), (l), 0)
                                                    ^
/usr/include/wchar.h:132:8: note: 'wcslen' declared here
size_t  wcslen(const wchar_t *);
        ^
builtin.c:3839:9: warning: incompatible pointer to integer conversion passing 'size_t (const wchar_t *)' (aka 'unsigned long (const int *)') to parameter of type 'size_t' (aka 'unsigned long') [-Wint-conversion]
        return make_string(the_result, reslen);
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./awk.h:1331:46: note: expanded from macro 'make_string'
#define make_string(s, l)       make_str_node((s), (l), 0)
                                                   ^~~
./awk.h:1671:50: note: passing argument to parameter 'len' here
extern NODE *make_str_node(const char *s, size_t len, int flags);
                                                 ^
3 warnings and 2 errors generated.
make[2]: *** [builtin.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2