WadC requires a Java Runtime Environment to run, version 8 or newer. I recommend OpenJDK.
For Debian-based systems:
apt install openjdk-17-jre
On Fedora/Red Hat style systems
dnf install java-17-openjdk
You’ll also need a Doom engine. I
recommend Crispy Doom
(Debian package crispy-doom).
Finally you may require a node
builder. I recommend zdBSP (Debian
package zdbsp).
IWAD (game data). If you don’t have the
commercial game data, buy it
from GoG or grab FreeDoom (Debian package
freedoom).
Unpack everything.
Launch WadC by double-clicking the JAR file.
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Tip
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failing that, from a command-line, java -jar wadc*with-dependencies.jar
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Open WadC’s preferences dialog (macOS: ⌘ + ,) and set the paths to the game engine, IWAD and node builder (these should be set to sensible defaults already if you installed the Debian package).
Most Doom Engines for Mac OS are distributed as "app bundles": within
the UI, they appear like applications that can be double-clicked, have
an icon, etc.; but under the hood they are actually folders that contain
other files (e.g. Eternity.app/). One of the included files is the
actual engine program.
When selecting the game engine, WadC requires you to select the engine
program from within the App bundle. The File chooser should let you
expand the App as if it were a folder and browse the contents. For
example, for Eternity, the engine is
Eternity.app/Contents/MacOS/Eternity Engine.