• The core library
• The standard library
• The compiler front-end
• The unix library: Unix system calls
• The num library: arbitrary-precision rational arithmetic
• The str library: regular expressions and string processing
• The threads library
• The graphics library
• The dynlink library: dynamic loading and linking of object files
• The bigarray library

Chapter 31  The graphics library

Since OCaml 4.09, the graphics library is distributed as an external package. Its new home is:

https://github.com/ocaml/graphics

If you are using the opam package manager, you should install the corresponding graphics package:

        opam install graphics

Before OCaml 4.09, this package simply ensures that the graphics library was installed by the compiler, and starting from OCaml 4.09 this package effectively provides the graphics library.