diff --git a/recipes/recipes_emscripten/eclib/build.sh b/recipes/recipes_emscripten/eclib/build.sh
new file mode 100644
index 0000000000..ce5052dd3d
--- /dev/null
+++ b/recipes/recipes_emscripten/eclib/build.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+set -e
+
+autoreconf -vfi
+
+emconfigure ./configure \
+    --prefix=$PREFIX \
+    --disable-shared \
+    --enable-static \
+    --with-flint=$PREFIX \
+    --with-ntl=$PREFIX \
+    --with-pari=$PREFIX \
+    CPPFLAGS="-I$PREFIX/include" \
+    LDFLAGS="-L$PREFIX/lib"
+
+
+find . -type f -name "Makefile" -exec sed -i 's/^LIBS =.*/& -lmpfr -lgmp/g' {} +
+
+emmake make
+emmake make install
+
+cp progs/*.wasm $PREFIX/bin
diff --git a/recipes/recipes_emscripten/eclib/recipe.yaml b/recipes/recipes_emscripten/eclib/recipe.yaml
new file mode 100644
index 0000000000..b083ccb1f8
--- /dev/null
+++ b/recipes/recipes_emscripten/eclib/recipe.yaml
@@ -0,0 +1,49 @@
+context:
+  name: eclib
+  version: '20250627'
+
+package:
+  name: ${{ name }}
+  version: ${{ version }}
+
+source:
+  url: https://github.com/JohnCremona/eclib/releases/download/${{ version }}/eclib-${{ version }}.tar.bz2
+  sha256: b88d4b52612e491c5415946d9e35f2062ca1015ee7fbbe0b61f158fa74cb4bc9
+
+build:
+  number: 0
+
+requirements:
+  build:
+  - autoconf
+  - automake
+  - libtool
+  - make
+  - ${{ compiler("c") }}
+  - ${{ compiler('cxx') }}
+  - pkg-config
+  - autoconf-archive
+  host:
+  - gmp 
+  - ntl
+  - libflint
+  - pari
+  - mpfr
+
+tests:
+  - package_contents:
+      files:
+        - include/eclib/interface.h
+        - lib/libec.a
+        - lib/pkgconfig/eclib.pc
+        - bin/mwrank
+
+about:
+  homepage: https://github.com/JohnCremona/eclib
+  license: GPL-2.0-only
+  license_file: COPYING
+  summary: The eclib package includes mwrank (for 2-descent on elliptic curves over Q) and modular symbol code used to create the elliptic curve database.
+
+extra:
+  recipe-maintainers:
+  - mkoeppe
diff --git a/recipes/recipes_emscripten/passagemath-eclib/recipe.yaml b/recipes/recipes_emscripten/passagemath-eclib/recipe.yaml
new file mode 100644
index 0000000000..4309cd3a6e
--- /dev/null
+++ b/recipes/recipes_emscripten/passagemath-eclib/recipe.yaml
@@ -0,0 +1,83 @@
+context:
+  version: 10.8.7
+
+package:
+  name: passagemath-eclib
+  version: ${{ version }}
+
+source:
+- url: https://pypi.org/packages/source/p/passagemath-eclib/passagemath_eclib-${{ version }}.tar.gz
+  sha256: d0be686f01864847c4263abaa045745c1ccbdbbe22485c9d320a1647b57fb90c
+
+build:
+  script: ${{ PYTHON }} -m pip install .
+  number: 0
+
+requirements:
+  build:
+  - python
+  - crossenv >=1.2
+  - cross-python_emscripten-wasm32
+  - ${{ compiler("c") }}
+  - ${{ compiler("cxx") }}
+  - pip
+  - passagemath-setup
+  - passagemath-environment
+  - cython
+  - cysignals
+  - pkgconfig
+  - numpy
+  - passagemath-abi == ${{ version }}
+  host:
+  - python
+  - numpy
+  - eclib
+  - fflas-ffpack
+  - givaro
+  - gmp
+  - libflint
+  - linbox
+  - mpfr
+  - ntl
+  - pari
+  - passagemath-categories
+  - passagemath-flint
+  - passagemath-linbox
+  - passagemath-modules
+  - passagemath-ntl
+  run:
+  - python
+  - cysignals
+  - passagemath-categories
+  - passagemath-linbox
+  - passagemath-modules
+  - passagemath-ntl
+
+tests:
+- script: pytester
+  files:
+    recipe:
+    - test_passagemath_eclib.py
+  requirements:
+    build:
+    - pytester
+    run:
+    - pytester-run
+    - passagemath-repl
+
+about:
+  license: GPL-2.0-or-later
+  license_file: README.rst
+  summary: 'passagemath: Elliptic curves over the rationals with eclib/mwrank'
+  description: |
+    Distribution of a part of the Sage library.
+    It provides the Cython interface to John Cremona's programs for enumerating
+    and computing with elliptic curves defined over the rational numbers.
+
+extra:
+  emscripten_tests:
+    python:
+      pytest_files:
+      - test_passagemath_eclib.py
+  recipe-maintainers:
+  - mkoeppe
diff --git a/recipes/recipes_emscripten/passagemath-eclib/test_passagemath_eclib.py b/recipes/recipes_emscripten/passagemath-eclib/test_passagemath_eclib.py
new file mode 100644
index 0000000000..41c75d4bc8
--- /dev/null
+++ b/recipes/recipes_emscripten/passagemath-eclib/test_passagemath_eclib.py
@@ -0,0 +1,5 @@
+import pytest
+
+
+def test_import_passagemath_eclib():
+    import passagemath_eclib