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It's primarily used to build [Clojure](https://clojure.org/) applications.\n\nIf you're using a different JVM build tool, use the appropriate buildpack:\n* [Java buildpack](https://github.com/heroku/heroku-buildpack-java) for [Maven](https://maven.apache.org/) projects\n* [Gradle buildpack](https://github.com/heroku/heroku-buildpack-gradle) for [Gradle](https://gradle.org/) projects\n* [Scala buildpack](https://github.com/heroku/heroku-buildpack-scala) for [sbt](https://www.scala-sbt.org/) projects\n\n## Table of Contents\n\n- [Supported Leiningen Versions](#supported-leiningen-versions)\n- [Getting Started](#getting-started)\n- [Application Requirements](#application-requirements)\n- [Configuration](#configuration)\n  - [OpenJDK Version](#openjdk-version)\n  - [Leiningen Version](#leiningen-version)\n  - [Buildpack Configuration](#buildpack-configuration)\n- [Documentation](#documentation)\n\n## Supported Leiningen Versions\n\nThis buildpack officially supports Leiningen `2.x`. Leiningen `1.x` is no longer supported.\n\n## Getting Started\n\nSee the [Getting Started with Clojure on Heroku](https://devcenter.heroku.com/articles/getting-started-with-clojure) tutorial.\n\n## Application Requirements\n\nYour app requires a `project.clj` file in the root directory with `:min-lein-version \"2.0.0\"` or higher. It's recommended to also configure `:uberjar-name` in your `project.clj`.\n\n## Configuration\n\n### OpenJDK Version\n\nSpecify an OpenJDK version by creating a `system.properties` file in the root of your project directory and setting the `java.runtime.version` property. See the [Java Support article](https://devcenter.heroku.com/articles/java-support#supported-java-versions) for available versions and configuration instructions.\n\n### Leiningen Version\n\nThe buildpack uses Leiningen `2.12.0` by default for projects that specify `:min-lein-version \"2.0.0\"` or higher in their `project.clj`.\n\nTo use a specific Leiningen version, you can include a `bin/lein` script in your repository. The buildpack will detect and use this script instead of the default Leiningen installation.\n\n### Buildpack Configuration\n\nConfigure the buildpack by setting environment variables:\n\n| Environment Variable | Description | Default |\n|---------------------|-------------|---------|\n| `LEIN_BUILD_TASK` | Leiningen task to execute | `uberjar` (if `:uberjar-name` is set) or `with-profile production compile :all` |\n| `LEIN_INCLUDE_IN_SLUG` | Include Leiningen in the slug for runtime use | `no` |\n| `CLOJURE_CLI_VERSION` | Clojure CLI tools version | `1.12.4.1597` |\n\nYou can also override the default build behavior by including a `bin/build` script in your repository. The buildpack will execute this script instead of the default build command.\n\n## Documentation\n\nFor more information about using Clojure on Heroku, see the [Clojure Support](https://devcenter.heroku.com/categories/clojure-support) documentation on Dev Center.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fheroku%2Fheroku-buildpack-clojure","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fheroku%2Fheroku-buildpack-clojure","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fheroku%2Fheroku-buildpack-clojure/lists"}