diff --git a/wscript b/wscript
index 2e7594c4..203eab8c 100644
--- a/wscript
+++ b/wscript
@@ -81,6 +81,9 @@ def configure(conf):
     conf.check_tool('compiler_cxx')
     conf.check_tool('compiler_cc')
 
+    conf.env.append_unique('CXXFLAGS', '-O3 -Wall')
+    conf.env.append_unique('CCFLAGS', '-O3 -Wall')
+
     conf.sub_config('common')
     if conf.env['IS_LINUX']:
         conf.sub_config('linux')