why ??? my nc tools no't inst

zwlww

[root@Magic nc]# make linux
make -e cryptcat  XFLAGS='-DLINUX' STATIC=-static
make[1]: Entering directory `/root/tools/nc'
make[1]: `cryptcat' is up to date.
make[1]: Leaving directory `/root/tools/nc'
[root@Magic nc]# gcc -o nc netcat.c
/tmp/ccFbaKA4.o: In function `readwrite':
/tmp/ccFbaKA4.o(.text+0x17b0): undefined reference to `farm9crypt_read'
/tmp/ccFbaKA4.o(.text+0x1972): undefined reference to `farm9crypt_write'
/tmp/ccFbaKA4.o: In function `main':
/tmp/ccFbaKA4.o(.text+0x1a76): undefined reference to `farm9crypt_init'
/tmp/ccFbaKA4.o(.text+0x1a7e): undefined reference to `res_init'
collect2: ld returned 1 exit status

兄弟们帮帮我！！！