cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration wchar/vwprintf.c -o wchar/vwprintf -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
wchar/vwprintf.c: In function ‘indirect’:
wchar/vwprintf.c:18:14: error: implicit declaration of function ‘vwprintf’; did you mean ‘vdprintf’? [-Wimplicit-function-declaration]
   18 |         if ( vwprintf(format, ap) < 0 )
      |              ^~~~~~~~
      |              vdprintf
wchar/vwprintf.c:24:15: error: implicit declaration of function ‘fgetws’; did you mean ‘fgets’? [-Wimplicit-function-declaration]
   24 |         if ( !fgetws(buf, sizeof(buf)/sizeof(buf[0]), stdin) )
      |               ^~~~~~
      |               fgets