diff --git a/projects/cython.org/package.yml b/projects/cython.org/package.yml
index 56fff644..0f42c2fe 100644
--- a/projects/cython.org/package.yml
+++ b/projects/cython.org/package.yml
@@ -18,8 +18,13 @@ build:
     pip.pypa.io: '*'
 
 test:
-  script: |
-    python setup.py build_ext --inplace
-    test "$(python -c 'import package_manager')" = "You are using tea"
+  dependencies:
+    llvm.org: '*'
   env:
     PYTHONPATH: "{{prefix}}/venv/lib/python3.11/site-packages"
+    linux:
+      CC: clang
+      AS: llvm-as
+  script:
+  - python setup.py build_ext --inplace
+  - test "$(python -c 'import package_manager')" = "You are using pkgx"