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INSTALL.md

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Installing From Sources

To install and use Coq, we recommend relying on the Coq platform or on a package manager (e.g. opam or Nix).

See https://coq.inria.fr/download and https://github.com/coq/coq/wiki#coq-installation to learn more.

If you need to build Coq from sources manually (e.g. to contribute to Coq or to write a Coq package), the remainder of this file explains how to do so.

Build Requirements

To compile Coq yourself, you need:

  • OCaml (version >= 4.09.0) (This version of Coq has been tested up to OCaml 4.14.0)

  • The Dune OCaml build system >= 2.9.1

  • The ZArith library >= 1.11

  • The findlib library (version >= 1.8.1)

  • a C compiler

  • an IEEE-754 compliant architecture with rounding to nearest ties to even as default rounding mode (most architectures should work nowadays)

  • for CoqIDE, the lablgtk3-sourceview3 library (version >= 3.1.2), and the corresponding GTK 3.x libraries, as of today (gtk+3 >= 3.18 and gtksourceview3 >= 3.18)

  • [optional] GNU Make (version >= 3.81)

See below for a discussion of platform-specific issues with dependencies.

Primitive floating-point numbers require IEEE-754 compliance (Require Import Floats). Common sources of incompatibility are checked at configure time, preventing compilation. In the unlikely event an incompatibility remains undetected, using Floats would enable proving False on this architecture.

Note that OCaml dependencies (zarith and lablgtk3-sourceview3 at this moment) must be properly registered with findlib/ocamlfind since Coq's build system uses findlib to locate them.

Debian / Ubuntu users can get the necessary system packages for CoqIDE with:

$ sudo apt-get install libgtksourceview-3.0-dev

Opam (https://opam.ocaml.org/) is recommended to install OCaml and the corresponding packages.

$ opam switch create coq --packages="ocaml-variants.4.12.0+options,ocaml-option-flambda"
$ eval $(opam env)
$ opam install dune ocamlfind zarith lablgtk3-sourceview3

should get you a reasonable OCaml environment to compile Coq. See the OPAM documentation for more help.

Nix users can also get all the required dependencies by running:

$ nix-shell

Run-time dependencies of native compilation

The OCaml compiler and findlib are build-time dependencies, but also run-time dependencies if you wish to use the native compiler.

Build and install procedure

Note that Coq supports a faster, but less optimized developer build, but final users must always use the release build. See dev/doc/build-system.dune.md for more details.

To build and install Coq (and CoqIDE if desired) do:

$ ./configure -prefix <install_prefix> $options
$ make dunestrap
$ dune build -p coq-core,coq-stdlib,coq,coqide-server,coqide
$ dune install --prefix=<install_prefix> coq-core coq-stdlib coq coqide-server coqide

You can drop the coqide packages if not needed.

Packagers may want to play with dune install options as to tweak installation path, the -prefix argument in ./configure tells Coq where to find its standard library, but doesn't control any other installation path these days.

OCaml toolchain advisory

When loading plugins or vo files, you should make sure that these were compiled with the same OCaml setup (version, flags, dependencies...) as Coq. Distribution of pre-compiled plugins and .vo files is only possible if users are guaranteed to have the same Coq version compiled with the same OCaml toolchain. An OCaml setup mismatch is the most probable cause for an Error while loading ...: implementation mismatch on ....

coq_environment.txt

Coq binaries which honor environment variables, such as COQLIB, can be seeded values for these variables by placing a text file named coq_environment.txt next to them. The file can contain assignments like COQLIB="some path", that is a variable name followed by = and a string that follows OCaml's escaping conventions. This feature can be used by installers of binary package to make Coq aware of its installation path.

Known problems

  • On OSX, when using Opam with sandboxing and Dune < 3.0 with caching enabled, Coq may fail to install, due to Opam's sandboxing restricting the permissions needed for the Dune 2.x caching daemon. See coq#15138 more details.