I reached out to my engine developer and this was what he had to say, I hope this helps!
"That means that the Linux system does not have SDL 1.2 libraries installed. Almost all Linuxes will have a package available for SDL 1.2 since it is a popular library for a lot of games.
If they have Debian or Ubuntu or a Linux from that family they should look for a package called something like libsdl-1.2
For CentOS or Redhat or a Linux from that family, should look for SDL-1.2
Also it is worth mentioning that SDL 2.0 will not work. The newer version of the library is not backwards compatible with SDL 1.2 (but it should always be possible to install both versions at the same time. They do not conflict)"