Disable DGL's file browser. This plugin does not need it, and it would make the build fail because of mntent.h (which does not appear to exist on FreeBSD)
Fix missing GL include while building Wolf Common:
In file included from Common/Utils/src/Mathf.cpp:1:
In file included from ../../dpf/dgl/Geometry.hpp:20:
../../dpf/dgl/Base.hpp:82:11: fatal error: 'GL/gl.h' file not found
/usr/bin/env bash
, which should be more portable.