elan vs PHPBrew

elan manages installations of the Lean theorem prover on Linux, macOS and Windows. Its `lean` and `lake` binaries use a project’s `lean-toolchain` file to select the specified Lean version and download it when needed. The separate `elan` command provides manual control to install, select, run or uninstall Lean versions. The project supports version pinning, lockfiles, automatic switching, shell integration and CI/CD use. Installation options include shell instructions for Linux and macOS, a PowerShell method for Windows, and release downloads for supported platforms. The README recommends the Nixpkgs version on NixOS because toolchains downloaded by elan require patching there. Lake needs git to download dependencies. The project describes itself as a fork of rustup adapted for Lean infrastructure. elan is free at free, and the repository lists Apache-2.0 and MIT licenses. The releases page identifies v4.2.4 as the latest release.

PHPBrew builds and installs multiple PHP versions in a user’s home directory, including without root permission. It is intended for Linux and macOS and compiles PHP from source. Build variants simplify configuration choices such as PDO, MySQL, SQLite, and debug support. Users can temporarily select a version or change the default, with bash and zsh integration for switching and project version pinning. PHPBrew installs extensions from PHP source or PECL and can create configuration to enable them. It can compile Apache PHP modules and provides PHP-FPM management commands when PHP is built with the +fpm variant. Library lookup can use Homebrew, MacPorts, Debian, Ubuntu, or a custom path. Development packages must be installed before building. The project uses the MIT license and directs users to troubleshooting and wiki documentation. Builds of PHP versions no longer officially supported are not guaranteed, and issues involving versions older than 5.4 will not be fixed. The listed plan costs nothing.