cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations wchar/fwide.c -o wchar/fwide -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
wchar/fwide.c:5:27: error: ‘fwide’ undeclared here (not in a function)
    5 | int (*foo)(FILE *, int) = fwide;
      |                           ^~~~~