libextlib-ocaml software package provides extended standard library for OCaml (plugins), you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libextlib-ocaml
libextlib-ocaml is installed in your system.
Make ensure the libextlib-ocaml package were installed using the commands given below,
$ sudo dpkg-query -l | grep libextlib-ocaml *
You will get with libextlib-ocaml package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Ocaml |
| Package | libextlib-ocaml |
| Version | 1.6.1-1+b1 [s390x], 1.6.1-1 [a |
| Description | extended standard library for OCaml (plugins) |
| Sub Section | Ocaml |