How to a link to a C library to create static bindings?

[thebluepandabear]

Hello,

I am wanting to create my own C bindings to CSFML, and I have 
been extremely struggling with this.

There is no resources or tutorials for how to do this so I am 
basically on my own.

First thing I looked at was `dstep` which helps translate C 
header files to D language, so I ran `dstep` and translated the C 
header files to D language. This went well. I ended up wrapping 
all the code in an `extern(C)` call.

Now, I am trying to 'link' CSFML to my bindings but have been 
struggling to do so.

I tried to add the following to `dub.json`:

```
"libs": ["csfml-audio", "csfml-graphics"]
```

But it came back with an error:

```
/usr/bin/ld: 
/home/tom/Desktop/sfmld-backend/out/production/sfmld-backend/obj/sfmld-backend.o: in function `_Dmain':
/home/tom/Desktop/sfmld-backend/source/graphics.d:(.text._Dmain[_Dmain]+0x3a): undefined reference to `sfRenderWindow_create'
/usr/bin/ld: 
/home/tom/Desktop/sfmld-backend/source/graphics.d:(.text._Dmain[_Dmain]+0x58): undefined reference to `sfRenderWindow_isOpen'
/usr/bin/ld: 
/home/tom/Desktop/sfmld-backend/source/graphics.d:(.text._Dmain[_Dmain]+0x69): undefined reference to `sfRenderWindow_pollEvent'
/usr/bin/ld: 
/home/tom/Desktop/sfmld-backend/source/graphics.d:(.text._Dmain[_Dmain]+0x7c): undefined reference to `sfRenderWindow_close'
/usr/bin/ld: 
/home/tom/Desktop/sfmld-backend/source/graphics.d:(.text._Dmain[_Dmain]+0x90): undefined reference to `sfRenderWindow_clear'
/usr/bin/ld: 
/home/tom/Desktop/sfmld-backend/source/graphics.d:(.text._Dmain[_Dmain]+0x99): undefined reference to `sfRenderWindow_display'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
```

I am really confused as to how I even am supposed to get the 
library name in the first place, which is another thing that is 
confusing me.

Any help with this would be appreciated.