can't build about longs HOT 10 CLOSED

7 warnings generated.
cc -W -Wall -O2 -Wno-unused-parameter -g      -pthread -c -o waferapi.o waferapi.c
waferapi.c:268:14: error: use of undeclared identifier 'BUFFLEN'
    char buf[BUFFLEN];
             ^
waferapi.c:270:45: error: use of undeclared identifier 'BUFFLEN'
    ssize_t bytes_read = read(read_fd, buf, BUFFLEN);
                                            ^
waferapi.c:271:45: error: use of undeclared identifier 'cbuf'; did you mean 'buf'?
    ssize_t bytes_written = write(write_fd, cbuf, bytes_read);
                                            ^~~~
                                            buf
waferapi.c:268:10: note: 'buf' declared here
    char buf[BUFFLEN];
         ^

waferapi.c:271:45: error: use of undeclared identifier 'cbuf'; did you mean 'buf'?
    ssize_t bytes_written = write(write_fd, cbuf, bytes_read);
                                            ^~~~
                                            buf
waferapi.c:268:10: note: 'buf' declared here
    char buf[MAX_BUFFER_SIZE];
         ^