x86_64-managarm-gcc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdio/vsnprintf.c -o stdio/vsnprintf -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
stdio/vsnprintf.c:5:58: error: unknown type name ‘va_list’
    5 | int (*foo)(char *restrict, size_t, const char *restrict, va_list) = vsnprintf;
      |                                                          ^~~~~~~
stdio/vsnprintf.c:2:1: note: ‘va_list’ is defined in header ‘<stdarg.h>’; this is probably fixable by adding ‘#include <stdarg.h>’
    1 | #include <stdio.h>
  +++ |+#include <stdarg.h>
    2 | #ifdef vsnprintf