Or: how to fix the node “xgen_procedural” is not installed problem.

For example, suppose you want to render XGen hair in CINEMA 4D on macOS.

• From MtoA, export your XGen hair to an ass file.
• Set DYLD_LIBRARY_PATH before you start your application (for example, open a Terminal, set DYLD_LIBRARY_PATH there, and start CINEMA 4D the command line)

  export DYLD_LIBRARY_PATH=/Applications/Autodesk/maya2018/plug-ins/xgen/lib:/Applications/Autodesk/maya2018/Maya.app/Contents/MacOS

• Load the ass file into CINEMA 4D with an Arnold Procedural.
• Set the Plugin Search Path to the MtoA procedurals folder