Index: setup.py
--- setup.py.orig
+++ setup.py
@@ -111,7 +111,7 @@ def prepare_modules():
             "bottleneck.reduce",
             sources=["bottleneck/src/reduce.c"],
             depends=base_includes,
-            extra_compile_args=["-O2"],
+            extra_compile_args=[],
         )
     ]
     ext += [
@@ -122,7 +122,7 @@ def prepare_modules():
                 "bottleneck/src/move_median/move_median.c",
             ],
             depends=base_includes + ["bottleneck/src/move_median/move_median.h"],
-            extra_compile_args=["-O2"],
+            extra_compile_args=[],
         )
     ]
     ext += [
@@ -130,7 +130,7 @@ def prepare_modules():
             "bottleneck.nonreduce",
             sources=["bottleneck/src/nonreduce.c"],
             depends=base_includes,
-            extra_compile_args=["-O2"],
+            extra_compile_args=[],
         )
     ]
     ext += [
@@ -138,7 +138,7 @@ def prepare_modules():
             "bottleneck.nonreduce_axis",
             sources=["bottleneck/src/nonreduce_axis.c"],
             depends=base_includes,
-            extra_compile_args=["-O2"],
+            extra_compile_args=[],
         )
     ]
     return ext