$OpenBSD$
--- configure.orig	Sun Dec 20 14:43:52 2015
+++ configure	Sun Dec 20 14:43:56 2015
@@ -3363,8 +3363,8 @@ else
   then
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: i686" >&5
 $as_echo "i686" >&6; }
-    CFLAGS="-Wall -march=i686 -O3 -fomit-frame-pointer -funroll-loops $CFLAGS"
-    CXXFLAGS="-Wall -march=i686 -O3 \
+    CFLAGS="-Wall -march=i686 -fomit-frame-pointer -funroll-loops $CFLAGS"
+    CXXFLAGS="-Wall -march=i686 \
               -fomit-frame-pointer -funroll-loops $CXXFLAGS"
 
   else
@@ -3372,14 +3372,14 @@ $as_echo "i686" >&6; }
     then
       { $as_echo "$as_me:${as_lineno-$LINENO}: result: x86_64" >&5
 $as_echo "x86_64" >&6; }
-      CFLAGS="-Wall -O3 -mtune=nocona -fomit-frame-pointer -funroll-loops $CFLAGS"
-      CXXFLAGS="-Wall -O3 -mtune=nocona \
+      CFLAGS="-Wall -mtune=nocona -fomit-frame-pointer -funroll-loops $CFLAGS"
+      CXXFLAGS="-Wall -mtune=nocona \
               -fomit-frame-pointer -funroll-loops $CXXFLAGS"
     else
       { $as_echo "$as_me:${as_lineno-$LINENO}: result: Other" >&5
 $as_echo "Other" >&6; }
-      CFLAGS="-Wall -O3 $CFLAGS"
-      CXXFLAGS="-Wall -O3 $CXXFLAGS"
+      CFLAGS="-Wall $CFLAGS"
+      CXXFLAGS="-Wall $CXXFLAGS"
     fi
   fi
 fi
