Obviously, `make` is required to build. `fontconfig` is required for the default build, since it asks `fontconfig` for your system monospace font. It might be obvious, but `libX11` and `libXft` are required as well. Chances are, you have all of this installed already.
For many key variables, this build of `st` will look for X settings set in either `~/.Xdefaults` or `~/.Xresources`. You must run `xrdb` on one of these files to load the settings.
Note that when you run `wal`, it will negate the transparency of existing windows, but new windows will continue with the previously defined transparency.
Note that some special characters may appear truncated if too wide. You might want to manually set your prefered emoji/special character font to a lower size in the `config.h` file to avoid this. By default, JoyPixels is used at a smaller size than the usual text.