ws 1.12 unresolved external for get_plugin_dir

I'm getting the following build error when trying to create my plugin

packet-gena.obj : error LNK2019: unresolved external symbol __imp__get_plugin_dir referenced in function _proto_register_gena

filesystem.h was moved to the wsutil for 1.12 according to the changelog. I can also see from the mailing list it was moved because it was more of an appropriate place. The reasons was something along the lines of filesystem is used by the system and not just dissectors. I can see by using grep that mate and wimaxasncp have an include for it. So it looks like I should still be able to link to the code.

What should I be looking at to troubleshoot this?