--- a/setup.py
+++ b/setup.py
@@ -40,6 +40,7 @@
             e = sys.exc_info()[1]
             sys.stderr.write('%s\n' % str(e))
             sys.stderr.write(self.warning_message % ("extension modules", "There was an issue with your platform configuration - see above."))
+            raise
 
     def build_extension(self, ext):
         name = ext.name
@@ -49,6 +50,7 @@
             e = sys.exc_info()[1]
             sys.stderr.write('%s\n' % str(e))
             sys.stderr.write(self.warning_message % ("%s extension module" % name, "The output above this warning shows how the compilation failed."))
+            raise
 
 setup(
     name='pyrsistent',