Create an executable with GSL libraries in a Root image

Newbie
1

Following the solution of my own question here, I could create an executable of my code. Now I need to compile it in the DLX machine in my university. If I understood properly, we have the Root software as a singularity container. Therefore, I have to compile my code inside the container, after loading the Root image.
I can get the Root image to work (Version 6.06/08), but when I try to compile with “make” I get the error:

fatal error: gsl/gsl_matrix.h: No such file or directory
#include <gsl/gsl_matrix.h>

It seems that there is a problem with the GSL libraries. If I type root-config --has-builtin_gsl the output is “yes”, so the GSL libraries are there somewhere. I don’t know how to tell the compiler where these libraries are, since I am working with a Root image.
I did not change anything in my code or my “Makefile” after I could compile the code in my own machine.

How can I tell the compiler to use the GSL libraries that are in Root?

2

If you want to build code that uses gsl then you shouldn’t build ROOT with builtin gsl. Instead, install gsl into your container, then reconfigure (with cmake -Dbuiltin_gsl=Off if needed - but CMake should find your container’s gsl automatically) and rebuild ROOT.