Hi ! Thanks for Linux version, however this :

./MercTactics: error while loading shared libraries: libGLEW.so.2.1: cannot open shared object file: No such file or directory

I do have GLEW installed is seems.

I’m running Manjaro.

It might be installed in a place where it can't find it. 

Try and find where it's installed, then create a symlink

for instance, if it was installed in /usr/lib64

sudo ln -s /usr/lib64/libGLEW.so.2.1 /usr/lib/libGLEW.so

you could also try an uninstall and reinstall GLEW