diff --git a/Makefile b/Makefile
index db79d67b8..ab91fc900 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # This file is generated by tools/dmake, do not edit.
 
 ifndef CXXFLAGS
-    CXXFLAGS=-DHAVE_RULES -Wall -Wextra -Wshadow -pedantic -Wno-long-long -Wfloat-equal -Wcast-qual -g
+    CXXFLAGS=-O2 -DNDEBUG -DHAVE_RULES -Wall
 endif
 
 ifndef CXX