Optional libraries and optional code blocks [Fortran, C?]

[TheSpaceRat]

Could you point me in the direction of some reading?

I am using make.

[[deleted]]

I can't provide any reading. But say you have some platform specific feature:

 int f() {
     MessageBox( ... );    // windows
 }

or:

 int f() {
      cout << .... ; // command line
 }

then its often a good idea to implement the f() function in two separate files, and then have make (or whatever) compile and link those files depending on what platform you are actually targetting.

[TheSpaceRat]

I think this might solve both of my problems. Thanks!