ocaml / opam

# opam - A Package Manager for OCaml
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Opam is a source-based package manager for OCaml. It supports multiple simultaneous
compiler installations, flexible package constraints, and a Git-friendly development
workflow.
Opam was created and is maintained by OCamlPro.
To get started, checkout the Install
and Usage guides.
## Compiling This Repo
Either from an existing opam installation, use
`opam pin add .` if you cloned locally the repository,
`opam pin add git+https://github.com/ocaml/opam` otherwise, or:
* Make sure you have the required dependencies installed:
 - GNU make
 - OCaml >= 4.11 (or see below)
 - A C++ compiler (unless building without a solver, see `./configure --without-mccs`)
* Run `./configure` if you have all the OCaml dependencies installed.
 If not, run `./configure --with-vendored-deps`, this will
 locally take care of all OCaml dependencies for you (downloading them, unless
 you used the inclusive archive we provide for each release).
* Run `make`
* Run `make install`
This is all you need for installing and using opam, but if you want to use the
`opam-lib` (to work on opam-related tools), you need to link it to installed
libraries. It's easier to already have a working opam installation in this case,
so you can do it as a second step.
* Make sure to have `ocamlfind`, `ocamlgraph`, `cudf` >= 0.11~rc1,
 `dose3` >= 6.1, `re` >= 1.9.0, `opam-file-format` installed. Or run `opam install
 . --deps-only` if you already have a working instance. Re-run
 `./configure` once done
* Run `make libinstall` at the end
_Note_: If you install on your system (without changing the prefix), you will
need to install as root (`sudo`). As `sudo` does not propagate environment
variables, there will be some errors. You can use `sudo -E "PATH=$PATH"` in order
to ensure you have a good environment for install.
## Developer Mode
If you are developing opam, you may enable developer features by including the
`--enable-developer-mode` parameter with `./configure`.
## Compiling on Native Windows
Cygwin (https://www.cygwin.com/setup-x86_64.exe) is always required to build opam on
Windows.
The following Cygwin packages are required:
* From Devel - `make`
* From Devel - `patch` (not required if OCaml and all required packages are
 pre-installed)
* From Devel - `autoconf`
* From Devel - `curl`
* From Devel - `mingw64-i686-gcc-g++` & `mingw64-x86_64-gcc-g++` (not required if
 building with MSVC)
Alternatively, having downloaded Cygwin's setup program, Cygwin can be installed
using the following command line:
 [code] 
The `--no-desktop` and `--no-startmenu` switches may be omitted in order to create
shortcuts on the Desktop and Start Menu, respectively. Executed this way, setup will
still be interactive, but the packages will have been preselected. To make setup
fully unattended, choose a mirror URL from https://cygwin.com/mirrors.lst and add
the `--site` switch to the command line
(e.g., `--site=https://www.mirrorservice.org/sites