root@server-name# file portal
portal: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.36, not stripped

Install some i386 libaries on 64bit system.

apt-get install libc6:i386 libncurses5:i386 libstdc++6:i386 zlib1g:i386