安装是参考：http://blog.z-proj.com/enabling-l2tp-over-ipsec-on-ubuntu-16-04/的
但是在Configure the build的时候，一直报：
configure: error: Package requirements (libnma >= 1.8.0) were not met:
Requested 'libnma >= 1.8.0' but version of libnma is 1.2.6
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
Alternatively, you may set the environment variables LIBNMA_CFLAGS
and LIBNMA_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
我的Ubuntu最新libnma也是1.2.6，如何能下载1.8.0呢，新立得上面的版本也是1.2.6
请问如何能安装libnma1.8.0，如果安装成功会不会破坏包之间的依赖
