1、执行命令进入到 /usr/ports/lang/erlang目录下
cd /usr/ports/lang/erlang
2、执行安装命令
make install
3、系统开始下载erlang的源码及相关文件并进行编译安装
4、开始测试：
[umclient@newsearch] ~> erl
Erlang R15B02 (erts-5.9.2) [source] [64-bit] [smp:16:16] [async-threads:0] [kernel-poll:false]
Eshell V5.9.2 (abort with ^G)
1>
Erlang R15B02 (erts-5.9.2) [source] [64-bit] [smp:16:16] [async-threads:0] [kernel-poll:false]
Eshell V5.9.2 (abort with ^G)
1>
5、安装成功