diff --git a/Lib/test/test_cext/setup.py b/Lib/test/test_cext/setup.py
index 67dfddec751791..db43f6fb17a132 100644
--- a/Lib/test/test_cext/setup.py
+++ b/Lib/test/test_cext/setup.py
@@ -118,7 +118,7 @@ def main():
             print(f"Add PCbuild directory: {pcbuild}")
 
     # Display information to help debugging
-    for env_name in ('CC', 'CFLAGS'):
+    for env_name in ('CC', 'CFLAGS', 'CPPFLAGS'):
         if env_name in os.environ:
             print(f"{env_name} env var: {os.environ[env_name]!r}")
         else:
diff --git a/Lib/test/test_cppext/extension.cpp b/Lib/test/test_cppext/extension.cpp
index 7d360f88fdd1f1..06ef997d57af46 100644
--- a/Lib/test/test_cppext/extension.cpp
+++ b/Lib/test/test_cppext/extension.cpp
@@ -16,8 +16,9 @@
 #ifdef TEST_INTERNAL_C_API
    // gh-135906: Check for compiler warnings in the internal C API
 #  include "internal/pycore_frame.h"
-   // mimalloc emits compiler warnings when Python is built on Windows.
-#  if !defined(MS_WINDOWS)
+   // mimalloc emits compiler warnings when Python is built on Windows
+   // and macOS.
+#  if !defined(MS_WINDOWS) && !defined(__APPLE__)
 #    include "internal/pycore_backoff.h"
 #    include "internal/pycore_cell.h"
 #  endif
diff --git a/Lib/test/test_cppext/setup.py b/Lib/test/test_cppext/setup.py
index 98442b106b6113..a3eec1c67e1556 100644
--- a/Lib/test/test_cppext/setup.py
+++ b/Lib/test/test_cppext/setup.py
@@ -101,7 +101,7 @@ def main():
             print(f"Add PCbuild directory: {pcbuild}")
 
     # Display information to help debugging
-    for env_name in ('CC', 'CFLAGS', 'CPPFLAGS'):
+    for env_name in ('CC', 'CXX', 'CFLAGS', 'CPPFLAGS', 'CXXFLAGS'):
         if env_name in os.environ:
             print(f"{env_name} env var: {os.environ[env_name]!r}")
         else: