GSL installation procdure and linker related problems

[Simone Landini]

Hi evereyone, I try to be more precise wrt my previous help request.

I am using Microsoft Visual Studio Community 2019 (VSC2019).

I installed GSL using the vcpkg tool but I also copy&paste a gsl folder 
"C:\gsl" containing the latest gsl-2.6 files and folders: is this an 
appropriated procedure?

Here is the code

#include <stdio.h>
// the path to the gsl folder is in "C:\gsl"
#include <C:\gsl\specfunc\gsl_sf_bessel.h>
// the example
int main (void){
  double x = 5.0;
  double y = gsl_sf_bessel_J0 (x);
  printf ("J0(%g) = %.18e\n", x, y);
  return 0;
}

The VSC2019 editor does not highlight the "#include 
<C:\gsl\specfunc\gsl_sf_bessel.h>", so the library should be visible.

Then CTRL+F5 and I have 3 errors: this is what I get (I have an Italian 
version of VSC2019: I translate below)

Codice Descrizione Progetto 
File                                                     Riga
E1696    impossibile aprire il codice errore "gsl/gsl_mode.h" del file 
origine    ConsoleApplication5 C:\gsl\specfunc\gsl_sf_bessel.h    26

Code     Description Project 
File                                                     Row
E1696    impossible to open "gsl/gsl_mode.h" of the origin file         
               ConsoleApplication5 C:\gsl\specfunc\gsl_sf_bessel.h    26

The same errors for "gsl/gsl_precison.h" and "gsl/gsl_sf_result.h"

Are these linker related errors?

How can I specify library name and path to the linker?

Thank you

Simone