Add ntl, passagemath-ntl, passagemath-flint

[mkoeppe]

Template A: Checklist for adding a package

Pre-submission Checks

• Package requires building for emscripten-wasm32 platform (not a noarch package), in other words, the package requires compilation.

Recipe Structure

Added recipes/recipes_emscripten/[package-name]/recipe.yaml with proper structure:

• context section with version (and optionally name)
• package section with name and version using Jinja2 templates
• source section with:
  • Source URL is valid and points to archive file (.tar.gz, .tar.bz2, .tar.xz, .tgz, or .zip)
  • Source URL contains ${{ version }} template for version updates
  • SHA256 hash is correct (verified with curl -sL <url> | sha256sum)
  • Patches (if any) are included in [package-name]/patches/ directory
• build section with appropriate script/method
  • Python packages: ${PYTHON} -m pip install . ${PIP_ARGS}
  • R packages: $R CMD INSTALL $R_ARGS .
  • C++ packages: Uses emcmake/emmake or emconfigure/emmake
  • Rust packages: Uses rust-nightly and maturin or appropriate Rust build tool
  • Build number is 0
  • If the script is longer than 3 lines, a build.sh is included
• requirements section (build, host, run as needed)
• tests section
  • Python packages: test_import_[package].py file created and referenced
  • C++ packages: Test executable or package_contents test
  • R packages: Package contents test
• about section with license, homepage, summary

---

PR Formatting

• PR title follows format: Add [package-name] or Update [package-name] to [version]
• PR description includes:
  • Version being added/updated
  • Any special build considerations or patches applied

Package Details

• Package Name: ntl, passagemath-ntl, passagemath-flint
• Version: 11.6.0, 10.8.4, 10.8.4

Build Notes

• Part of Port to WebAssembly and package in pyodide, emscripten-forge passagemath/passagemath#1863
• FYI @victorshoup

[mkoeppe]

This does not do a crossbuild correctly

2026-03-09T06:18:19.2530572Z  │ │ compiler_name=gcc
2026-03-09T06:18:19.2531051Z  │ │ language_standard=2017
2026-03-09T06:18:19.2531523Z  │ │ cpu_type=x86
2026-03-09T06:18:19.2532231Z  │ │ os_name=linux

[mkoeppe]

conda-forge uses an ad-hoc patch for cross-building for another platform. https://github.com/conda-forge/ntl-feedstock/blob/main/recipe/0001-Do-not-run-binaries-when-cross-compiling-for-Silicon.patch
We could use the same approach if there is no better solution.

[wangyenshu]

Hello. I am working on adding singular system to emscripten-forge, which depends on ntl. I would like to help. I have a working ntl compiling script in https://github.com/Singular/Singular-in-browser/blob/main/build.sh (NTL blocks). This is not cleaned yet but can be used as a reference.

[mkoeppe]

Great, I'll be happy to collaborate on this. I'll take a look at your script in the next days.