I've just installed GSL, and I was reading the introduction and about including the appropriate directory for certain tasks (ie #include<gsl/gsl_sf_bessel.h>) it says
"If the directory is not installed on the standard search path of your compiler you will also
need to provide its location to the preprocessor as a command line flag."
So I have the location, but how do I do this?
If it told me, I didn't understand... Help appreciated. :)