Had the constraint wrong.

jamadden · jamadden · commit 666e374201a8 · 2023-09-01T17:41:20.000-05:00
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -172,7 +172,8 @@ jobs:
           pip install -q -U 'cffi;platform_python_implementation=="CPython"'
           pip install -q -U 'cython>=3.0'
           # Use a debug version of greenlet to help catch any errors earlier.
-          CFLAGS="$CFLAGS -Og -g -UNDEBUG" pip install -v --no-binary :all: 'greenlet>=2.0.0 ;platform_python_implementation=="CPython"' 'greenlet >= 3.0rc1; python_version >="3.12"'
+          CFLAGS="$CFLAGS -Og -g -UNDEBUG" pip install -v --no-binary :all: 'greenlet>=2.0.0;platform_python_implementation=="CPython" and python_version < "3.12"'
+          CFLAGS="$CFLAGS -Og -g -UNDEBUG" pip install -v --no-binary :all: 'greenlet>=3.0rc1;platform_python_implementation=="CPython" and python_version >= "3.12"'
 
       - name: Build gevent (non-Mac)
         if: ${{ ! startsWith(runner.os, 'Mac') }}
