GCC and making modules

During the Big Ben Club evening in Delft ( The Netherlands ) I was experimenting with using gcc to make modules. Yes I have ROOL as well but I forgot to take ROOL 4 with me so just download and install gcc.
My target was to make a module with C instead of BASIC which I normally do ;-). Start with the examples to have it compiled just create a directory h to make the ’Couldn’t create header file : xyz.h’ error go away