cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations wctype/iswblank_l.c -o wctype/iswblank_l -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
wctype/iswblank_l.c:5:20: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
int (*foo)(wint_t, locale_t) = iswblank_l;
                   ^
wctype/iswblank_l.c:5:32: error: use of undeclared identifier 'iswblank_l'; did you mean 'iswblank'?
int (*foo)(wint_t, locale_t) = iswblank_l;
                               ^~~~~~~~~~
                               iswblank
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/wctype.h:50:1: note: 'iswblank' declared here
iswblank(wint_t _wc)
^
wctype/iswblank_l.c:5:7: error: incompatible function pointer types initializing 'int (*)(wint_t, int)' (aka 'int (*)(int, int)') with an expression of type 'int (wint_t)' (aka 'int (int)') [-Werror,-Wincompatible-function-pointer-types]
int (*foo)(wint_t, locale_t) = iswblank_l;
      ^                        ~~~~~~~~~~
3 errors generated.