Allow Herb to be installed from source #880
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Previously Herb could only be installed if there was a precompiled gem available. This changes this by vendoring Prism on compile time.
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Hey @andreaslillebo, Prism already gets vendored with the gem that comes from RubyGems.org (see #515). We vendor Prism before we publish the gem using the Thank you for the pull request! 🙏🏼 |
marcoroth
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Jan 18, 2026
This pull request improves how the `herb` gem loads its native
extension, particularly for users running preview/development versions
of Ruby.
1. Detect preview Ruby versions (`RUBY_PATCHLEVEL == -1`) and skip
precompiled extensions to avoid ABI incompatibility errors like
`undefined symbol: ruby_abi_version`
2. Add helpful error messages when the native extension fails to load,
including:
* What paths were tried
* Common causes (preview Ruby, missing compilation, missing build tools)
* How to reinstall with source compilation
* Platform-specific instructions for installing C compilers
3. Remove unnecessary `rake templates` call from `extconf.rb` since
generated files are already bundled in the gem
Resolves #880
Resolves #951
Resolves #1046
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Thanks again for all the awesome work on the Herb. It is amazing 🤩
Previously Herb could only be installed if there was a precompiled gem available.
This changes this by vendoring Prism on compile time.
Allows workaround for issues like #874