That is one of the two guides that I was referring to. I was not so much concerned with it's prominence as it's clarity.
I found the Linux section confusing, and my attempts to install the required libraries gave me messages that they were not found or had had their functions taken by other libraries. I still think that a less confusing guide specific to Linux would be helpful.
This was the result of trying to install the listed dependencies:
sudo apt install libsdl1.2 libsdl-mixer1.2 libsdl-gfx1.2 libsdl-image1.2 yamlcpp
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'libsdl-gfx1.2-dev' for regex 'libsdl-gfx1.2'
Note, selecting 'libsdl-gfx1.2-doc' for regex 'libsdl-gfx1.2'
Note, selecting 'libsdl-gfx1.2-5' for regex 'libsdl-gfx1.2'
Package libsdl1.2 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'libsdl1.2' has no installation candidate
E: Unable to locate package yamlcpp
My mistakes in interpreting the guide involved naming a folder XCOM, which is the steam installation name, instead of UFO, which is what openxcom looks for. I named a folder OpenXcom instead of openxcom, and the installer did not find it. I tried making a folder named "user," while the guide treats a folder as a user folder but does not look for the named folder "user." Also, the windows section says that it's installer automatically detects a steam installation and I mistakenly assumed that the Linux installer would do so as well.
I don't know enough about either openxcom or Linux to do it myself, but I was very confused by the Linux section of the guide, and think that it could be made more clear, and preferably separate.