Find out Nmap version you are running on your machine with the -V option.
nmap -V
result:
Nmap version 6.40 ( http://nmap.org ) Platform: x86_64-pc-linux-gnu Compiled with: liblua-5.2.3 openssl-1.0.1f libpcre-8.31 libpcap-1.5.3 nmap-libdnet-1.12 ipv6 Compiled without: Available nsock engines: epoll poll select