Building current master on arch linux, I get this:
../../include/iscript.h:7:28: error: using typedef-name ‘using module = class pybind11::module_’ after ‘class’
7 | namespace pybind11 { class module; class dict; }
| ^~~~~~
In file included from ScriptingSystem.h:5,
from ScriptingSystem.cpp:1:
/usr/include/pybind11/pybind11.h:1017:7: note: ‘using module = class pybind11::module_’ has a previous declaration here
1017 | using module = module_;
| ^~~~~~