diff --git a/projects/cython.org/package.yml b/projects/cython.org/package.yml
new file mode 100644
index 00000000..7ea77b90
--- /dev/null
+++ b/projects/cython.org/package.yml
@@ -0,0 +1,26 @@
+distributable:
+  url: https://github.com/cython/cython/archive/refs/tags/{{version}}.tar.gz
+  strip-components: 1
+
+versions:
+  github: cython/cython/releases
+
+provides:
+  - bin/cython
+
+dependencies:
+  python.org: '*'
+  tea.xyz/gx/cc: c99
+
+build:
+  script: |
+    python-venv.py {{prefix}}/bin/cython
+  dependencies:
+    pip.pypa.io: '*'
+
+test:
+  script: |
+    python setup.py build_ext --inplace
+    test "$(python -c 'import package_manager')" = "You are using tea"
+  env:
+    PYTHONPATH: "{{prefix}}/venv/lib/python3.11/site-packages"
diff --git a/projects/cython.org/package_manager.pyx b/projects/cython.org/package_manager.pyx
new file mode 100644
index 00000000..7a0898b8
--- /dev/null
+++ b/projects/cython.org/package_manager.pyx
@@ -0,0 +1 @@
+print 'You are using tea'
diff --git a/projects/cython.org/setup.py b/projects/cython.org/setup.py
new file mode 100644
index 00000000..a7018ae7
--- /dev/null
+++ b/projects/cython.org/setup.py
@@ -0,0 +1,6 @@
+from distutils.core import setup
+from Cython.Build import cythonize
+
+setup(
+  ext_modules = cythonize("package_manager.pyx")
+)