I use fltk to make a program.
This is my program:

    #include<FL/FL.h>
    #include<FL/Fl_Window.h>
    using namespace std;
    int main(){
        Fl_Window window(300,100);
        window.show(1234,"3425");
        return Fl::run;
    }

then it says No such File

I try to move the fltk to the folder，but it still can’t run.How can it run?