diff --git a/Makefile b/Makefile
index c7f4c78cb..044e6455c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,5 @@
-# This file is generated by tools/dmake, do not edit.
-
 ifndef CXXFLAGS
-    CXXFLAGS=-Wall -Wextra -Wshadow -pedantic -Wno-long-long -Wfloat-equal -Wcast-qual -Wsign-conversion -g
+    CXXFLAGS=-O2 -DNDEBUG -Wall
 endif
 
 ifndef CXX