Heroku Buildpack for Ghostscript

Installs Ghostscript on Heroku. Currently pinned to Ghostscript 10.07.1.

Stack-specific binaries are published as separate assets on each release. The compile script reads $STACK at install time and downloads the matching package, so the same buildpack works across heroku-22, heroku-24, and heroku-26 (provided a binary has been built and uploaded for that stack).

Install

Add this buildpack to your Heroku app:

heroku buildpacks:add https://github.com/commandpostsoft/heroku-buildpack-ghostscript.git

Or with multiple buildpacks, create a .buildpacks file:

https://github.com/heroku/heroku-buildpack-ruby.git
https://github.com/commandpostsoft/heroku-buildpack-ghostscript.git

Updating Ghostscript Version

Quick Start

./build/release.sh                       # Latest version, heroku-26
./build/release.sh 10.07.1               # Specific version, heroku-26
./build/release.sh 10.07.1 heroku-24     # Specific version, specific stack
./build/release.sh latest heroku-22      # Latest version, specific stack

This script automatically:

• Checks if the stack-specific asset already exists on the release
• If yes: re-pins bin/compile (fast)
• If no: builds from source on the matching Ubuntu image, uploads the asset to the v$VERSION release, then re-pins bin/compile

To support a new stack on an existing release, just run release.sh again with a different STACK argument — it appends a new asset.

Requirements

• GitHub CLI (gh) — brew install gh
• Docker (only needed if building a new binary)

Stack → Ubuntu mapping

Heroku Stack	Ubuntu Image
heroku-22	ubuntu:22.04
heroku-24	ubuntu:24.04
heroku-26	ubuntu:26.04

Individual Scripts

For more control, you can run the steps separately:

Script	Purpose
build/build.sh VERSION [STACK]	Compile Ghostscript from source for one stack
build/upload.sh VERSION [STACK]	Upload that binary as a release asset
build/update.sh VERSION	Re-pin bin/compile to a version