1 files changed, 3 insertions, 0 deletions
diff --git a/setup.py b/setup.py
index 1ac68df..06fd9be 100644
--- a/setup.py
+++ b/setup.py
@@ -540,6 +540,9 @@ class PyBuildExt(build_ext):
                   "APIs, https://github.com/libressl-portable/portable/issues/381")
             print()
 
+        if os.environ.get("PYTHONSTRICTEXTENSIONBUILD") and (self.failed or self.failed_on_import):
+            raise RuntimeError("Failed to build some stdlib modules")
+
     def build_extension(self, ext):
 
         if ext.name == '_ctypes':