cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration wchar/vfwprintf.c -o wchar/vfwprintf -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
wchar/vfwprintf.c: In function ‘indirect’:
wchar/vfwprintf.c:14:14: error: implicit declaration of function ‘vfwprintf’; did you mean ‘vfprintf’? [-Wimplicit-function-declaration]
   14 |         if ( vfwprintf(fp, format, ap) < 0 )
      |              ^~~~~~~~~
      |              vfprintf
wchar/vfwprintf.c:21:15: error: implicit declaration of function ‘fgetws’; did you mean ‘fgets’? [-Wimplicit-function-declaration]
   21 |         if ( !fgetws(buf, sizeof(buf)/sizeof(buf[0]), fp) )
      |               ^~~~~~
      |               fgets