cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration wchar/wprintf.c -o wchar/wprintf -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
wchar/wprintf.c: In function ‘main’:
wchar/wprintf.c:15:14: error: implicit declaration of function ‘wprintf’; did you mean ‘dprintf’? [-Wimplicit-function-declaration]
   15 |         if ( wprintf(L"hello %ls %d", L"world", 42) < 0 )
      |              ^~~~~~~
      |              dprintf
wchar/wprintf.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]), stdin) )
      |               ^~~~~~
      |               fgets