How do I use UProceduralMeshComponent? (can't #include)

A dependency to the ProceduralMeshComponent module is required in one’s ModuleRules build file. For example:

MyGame.Build.cs

public class MyGame : ModuleRules
{
    public MyGame(TargetInfo Target)
    {
        PrivateDependencyModuleNames.AddRange(new string[] {"ProceduralMeshComponent"});
    }
}

One can then include ProceduralMeshComponent.h in C++ code:

#include "ProceduralMeshComponent.h"

Anyways, that’s what worked for me.