我正在尝试从源代码编译并安装quagga，并按照以下说明进行操作：
cd quagga-0.99.21-student-test2
./configure --enable-vtysh --enable-zebra --enable-ripd--disable-doc --disable-babeld --enable-isisd=no --disable-bgpd --disable-ospfd --disable-ospf6d --disable-ospfclient --enable-user=root --enable-group=root -enable-vty-group=root
make&& make install
但是制作时我失败了，制作“ vtysh”时出现了以下错误
vtysh_main.o: In function `main':
/share/quagga-0.99.21-student-test2/vtysh/vtysh_main.c:296: undefined reference to `vtysh_init_cmd'
collect2: ld returned 1 exit status
make[1]: *** [vtysh] Error 1
make[1]: Leaving directory `/share/quagga-0.99.21-student-test2/vtysh'
make: *** [install-recursive] Error 1
还是谢谢！