cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_types/reclen_t.c -o sys_types/reclen_t -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
sys_types/reclen_t.c:2:1: error: unknown type name 'reclen_t'
 reclen_t* foo;
 ^~~~~~~~