attempt to fix docs build

.github/workflows/pyop2.yml

@@ -39,6 +39,9 @@ jobs:
         id: setup-python
         with:
           python-version: ${{ matrix.python-version }}
+          # By default setup-python pollutes the environment in such a way that virtual
+          # environments cannot be used. This prevents us from building libsupermesh because
+          # it relies on having rtree installed into a venv.
           # https://github.com/actions/setup-python/issues/851
           # https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md#using-update-environment-flag
           update-environment: false

setup.py

@@ -159,7 +159,7 @@ def __getitem__(self, key):
     include_dirs=[f"{sys.prefix}/include"],
     library_dirs=[f"{sys.prefix}/lib"],
     libraries=["supermesh"],
-    runtime_library_dirs=[os.path.join(site.getsitepackages()[0], "supermesh", "lib")]
+    runtime_library_dirs=[f"{sys.prefix}/lib"],
 )
 
 # The following extensions need to be linked accordingly: