Hello together.
It seems like that some resources in the getmangos.sh file needed for CentOS are not available.
ftp://rpmfind.net/linux/centos/7.3.1611/os/x86_64/Packages/perl-Net-Telnet-3.03-19.el7.noarch.rpm ftp://rpmfind.net/linux/centos/7.3.1611/os/x86_64/Packages/libtool-2.4.2-21.el7_2.x86_64.rpm
Thank you.