loadlibrary, problem location of system header files

I had a C library code I was able to call from my matlab on linux, I want to do it now on windows (which I never use, so know nothing about it). My project only has a project.c and a project.h files.

After different trial (mingw, but 32bit problem, etc.) I used Visual Studio to compile my code and produce a dll. I had to compile it in C++, which could be a problem later as loadlibrary use C code (but I think I have a way to deal with it), but even before I had a stupid problem.

I used vcpkg to install the gsl on windows, and I have in my project.h a line

 #include <gsl/gsl_block.h>

Everything went fine on Visual Studio when I compiled, but matlab seems unable to find the gsl library, I have the following error : 'gsl/gsl_block.h'á: No such file or directory

I tried to use the syntax

 #include "path_to_gsl/gsl/gsl_block.h"

but problem is that headers like gsl_block.h have inclusion from others header of the gsl, using the syntax

 #include <gsl/gsl_ny_header.h> 

So I would have to make a copy of all the headers in another repo and modify each of them...

Is there an easy to way to tell matlab where to find the system headers I include with <systeme_header.h> ? includepath doesn't seems to do the job.