Attempting to Translate to Mac Xcode

[KGx55]

I am attempting to translate the program to C++ for Xcode. Am thinking it should be relatively simple because it is a console program and there is no need to be concerned about graphics.
I created an .xcodeproj file and started a project by pasting example/test_cpp.cpp into main().
I added all the .h files that are in the src folder. I expect errors and will need to work my way through them as they come up.
On the first attempt, I got an error that there is no config.h file. I included the config.h file from the win32/nec2++ folder.
Now the compile returns a series of undefined symbol errors. Below are the first four.

Undefined symbols for architecture x86_64:
"c_geometry::wire(int, int, double, double, double, double, double, double, double, double, double)", referenced from: _main in main.
"nec_context::initialize()", referenced from:_main in main.o
"nec_context::geometry_complete(int)", referenced from:_main in main.o
"nec_context::ex_card(excitation_type, int, int, int, double, double, double, double, double, double)", referenced from: _main in main.o

Since the .h files are included, it is a puzzle as to how to track down the problem.

One way to resolve issues is to build in a series of small steps that allow me to isolate problems. Are there suggestions on how to reconstruct this in small steps?

[KGx55]

This is a follow-up to my original post on this subject.
Upon further analysis I found that the following class functions (methods) have prototypes in the class definitions but the functions are not present. Are there any suggestions as to where these can be found?
c_geometry::wire(…)
nec_context::initialize()
nec_context::geometry_complete(int)
nec_context::ex_card(…)
nec_context::fr_card(…)
nec_context::gn_card(…)
nec_context::id_card(…)
nec_context::pt_card(…)
nec_context::rp_card(…)
nec_context::nec_context()
nec_context::~nec_context()

[KGx55]

The project moved forward by including all .cpp and .h files. Several of the .cpp files had main() functions that had to be removed as duplicates.

In file CurrentInput.h I am finding that on line 101, the array “segments” does not have a member named “diff”.

Calls to uniform_int_distribution.h functions are resulting in errors with one error message shown below. It seems the functions/methods, as presented by the program, do not meet the requirements of the MacOSX platform.

... __random/uniform_int_distribution.h:212:17 Static assertion failed due to requirement '__libcpp_random_is_valid_urng<Catch::RandomNumberGenerator, void>::value':