--- libcxml-0.15.5/wscript
+++ libcxml-0.15.5/wscript
@@ -36,7 +36,7 @@
     conf.load('compiler_cxx')
     if conf.options.enable_debug:
         conf.env.append_value('CXXFLAGS', '-g')
-    conf.env.append_value('CXXFLAGS', ['-Wall', '-Wextra', '-O2'])
+    conf.env.append_value('CXXFLAGS', ['-Wall', '-Wextra'])
     if conf.options.force_cpp11:
         conf.env.append_value('CXXFLAGS', ['-std=c++11', '-DBOOST_NO_CXX11_SCOPED_ENUMS'])