Il y a une page qui détaille la mise en place de l'environnement de développement : Installer son environement de développement

Composer (site officiel) est le gestionnaire de package de PHP.

L'installation est détaillée sur la page dédiée.

Laravel (site officiel) est le framework utilisé pour participalibre.

L'installation est détaillée sur la page dédiée.

Une fois composer et laravel installé, la doc propose d'installer les dépendances du projet.

On clone le dossier de participalibre :

$ git clone https://framagit.org/participalibre/participalibre.git

On se place dans ce dossier et on lance l'installation des dépendances :

$ cd participalibre
$ $ composer install
Installing dependencies from lock file (including require-dev)
Verifying lock file contents can be installed on current platform.
Your lock file does not contain a compatible set of packages. Please run composer update.
 
  Problem 1
    - laravel/framework is locked to version v7.14.1 and an update of this package was not requested.
    - laravel/framework v7.14.1 requires ext-mbstring * -> it is missing from your system. Install or enable PHP's mbstring extension.
  Problem 2
    - league/commonmark is locked to version 1.4.3 and an update of this package was not requested.
    - league/commonmark 1.4.3 requires ext-mbstring * -> it is missing from your system. Install or enable PHP's mbstring extension.
  Problem 3
    - tijsverkoyen/css-to-inline-styles is locked to version 2.2.2 and an update of this package was not requested.
    - tijsverkoyen/css-to-inline-styles 2.2.2 requires ext-dom * -> it is missing from your system. Install or enable PHP's dom extension.
  Problem 4
    - facade/ignition is locked to version 2.0.6 and an update of this package was not requested.
    - facade/ignition 2.0.6 requires ext-mbstring * -> it is missing from your system. Install or enable PHP's mbstring extension.
  Problem 5
    - phar-io/manifest is locked to version 1.0.3 and an update of this package was not requested.
    - phar-io/manifest 1.0.3 requires ext-dom * -> it is missing from your system. Install or enable PHP's dom extension.
  Problem 6
    - phpunit/php-code-coverage is locked to version 7.0.10 and an update of this package was not requested.
    - phpunit/php-code-coverage 7.0.10 requires ext-dom * -> it is missing from your system. Install or enable PHP's dom extension.
  Problem 7
    - phpunit/phpunit is locked to version 8.5.5 and an update of this package was not requested.
    - phpunit/phpunit 8.5.5 requires ext-dom * -> it is missing from your system. Install or enable PHP's dom extension.
  Problem 8
    - scrivo/highlight.php is locked to version v9.18.1.1 and an update of this package was not requested.
    - scrivo/highlight.php v9.18.1.1 requires ext-mbstring * -> it is missing from your system. Install or enable PHP's mbstring extension.
  Problem 9
    - theseer/tokenizer is locked to version 1.1.3 and an update of this package was not requested.
    - theseer/tokenizer 1.1.3 requires ext-dom * -> it is missing from your system. Install or enable PHP's dom extension.
  Problem 10
    - laravel/framework v7.14.1 requires ext-mbstring * -> it is missing from your system. Install or enable PHP's mbstring extension.
    - facade/flare-client-php 1.3.2 requires illuminate/pipeline ^5.5|^6.0|^7.0 -> satisfiable by laravel/framework[v7.14.1].
    - facade/flare-client-php is locked to version 1.3.2 and an update of this package was not requested.
 
To enable extensions, verify that they are enabled in your .ini files:
    - /etc/php/7.4/cli/php.ini
    - /etc/php/7.4/cli/conf.d/10-opcache.ini
    - /etc/php/7.4/cli/conf.d/10-pdo.ini
    - /etc/php/7.4/cli/conf.d/20-calendar.ini
    - /etc/php/7.4/cli/conf.d/20-ctype.ini
    - /etc/php/7.4/cli/conf.d/20-exif.ini
    - /etc/php/7.4/cli/conf.d/20-ffi.ini
    - /etc/php/7.4/cli/conf.d/20-fileinfo.ini
    - /etc/php/7.4/cli/conf.d/20-ftp.ini
    - /etc/php/7.4/cli/conf.d/20-gettext.ini
    - /etc/php/7.4/cli/conf.d/20-iconv.ini
    - /etc/php/7.4/cli/conf.d/20-json.ini
    - /etc/php/7.4/cli/conf.d/20-phar.ini
    - /etc/php/7.4/cli/conf.d/20-posix.ini
    - /etc/php/7.4/cli/conf.d/20-readline.ini
    - /etc/php/7.4/cli/conf.d/20-shmop.ini
    - /etc/php/7.4/cli/conf.d/20-sockets.ini
    - /etc/php/7.4/cli/conf.d/20-sysvmsg.ini
    - /etc/php/7.4/cli/conf.d/20-sysvsem.ini
    - /etc/php/7.4/cli/conf.d/20-sysvshm.ini
    - /etc/php/7.4/cli/conf.d/20-tokenizer.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.