There are two pre-compiled versions of LDAK:
ldak5.1.linux - designed to be run on Linux systems (tested on Ubuntu 18.04 and RedHat EL7)
ldak5.mac - designed to be run on a mac (tested on a Macbook Air)
Each of these should simply run (after unzipping and changing permissions)
If not, please see www.ldak.org/downloads2 for instructions on compiling your own version