./include/linux/sprintf.h:11:54: error: unknown type name 'va_list'
./include/linux/sprintf.h:13:71: error: unknown type name 'va_list'
./include/linux/sprintf.h:15:72: error: unknown type name 'va_list'
./include/linux/sprintf.h:17:70: error: unknown type name 'va_list'
./include/linux/sprintf.h:18:73: error: unknown type name 'va_list'
./include/linux/sprintf.h:21:55: error: unknown type name 'va_list'
./include/linux/fs.h:2666:9: error: implicit declaration of function 'vsnprintf' [-Werror=implicit-function-declaration]