-- If you build a bare server you don't need to have Irrlicht installed.
- - In that case use `-DIRRLICHT_SOURCE_DIR=/the/irrlicht/source`.
+- If you build a bare server you don't need to have the Irrlicht or IrrlichtMt library installed.
+ - In that case use `-DIRRLICHT_INCLUDE_DIR=/some/where/irrlicht/include`.
+- IrrlichtMt can also be installed somewhere that is not a standard install path.
+ - In that case use `-DCMAKE_PREFIX_PATH=/path/to/install_prefix`
+ - The path must be set so that `$(CMAKE_PREFIX_PATH)/lib/cmake/IrrlichtMt` exists
+ or that `$(CMAKE_PREFIX_PATH)` is the path of an IrrlichtMt build folder.