编译 ipvsadm 时报错了：usr/bin/ld: cannot find -lnl

[lobo-a]

虚拟机、centos7 mini版，使用的是lvs v2，kernel和keepalived都编译安装成功了，但是编译 ipvsadm 时报错了

报错如下：
gcc -Wall -Wunused -Wstrict-prototypes -g -o ipvsadm ipvsadm.o config_stream.o dynamic_array.o ../keepalived/keepalived/libipvs-2.6/libipvs.a -lpopt -lnl
/usr/bin/ld: cannot find -lnl
collect2: error: ld returned 1 exit status
make: *** [ipvsadm] Error 1

[mjzhou]

缺少nl库对应的安装包导致，yum install -y libnl libnl-devel