project Zad2 is
    type Impl_Type is ("iter", "rec");
    Impl : Impl_Type := external ("impl", "iter");
    
    for Main use ("main");
    for Source_Dirs use ("src", Impl);
    for Object_Dir use "target";

    package Builder is
        for Executable ("main.adb") use "z2";
    end Builder;

end Zad2;