diff --git a/.waf-tools/flags.py b/.waf-tools/flags.py
new file mode 100644
index 0000000..5b437eb
--- /dev/null
+++ b/.waf-tools/flags.py
@@ -0,0 +1,41 @@
+# -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-
+
+from waflib import Configure
+
+def configure(conf):
+    if conf.options.debug:
+        conf.define ('_DEBUG', 1)
+        flags = ['-O0',
+                 '-Wall',
+                 '-Wno-unused-variable',
+                 '-g3',
+                 '-Wno-unused-private-field', # only clang supports
+                 '-fcolor-diagnostics',       # only clang supports
+                 '-Qunused-arguments',        # only clang supports
+                 '-Wno-tautological-compare', # suppress warnings from CryptoPP
+                 '-Wno-unused-function',      # another annoying warning from CryptoPP
+
+                 '-Wno-deprecated-declarations',
+                 ]
+
+        conf.add_supported_cxxflags (cxxflags = flags)
+    else:
+        flags = ['-O3', '-g', '-Wno-tautological-compare','-Wno-unused-variable',
+                         '-Wno-unused-function', '-Wno-deprecated-declarations']
+        conf.add_supported_cxxflags (cxxflags = flags)
+
+@Configure.conf
+def add_supported_cxxflags(self, cxxflags):
+    """
+    Check which cxxflags are supported by compiler and add them to env.CXXFLAGS variable
+    """
+    self.start_msg('Checking allowed flags for c++ compiler')
+
+    supportedFlags = []
+    for flag in cxxflags:
+        if self.check_cxx (cxxflags=[flag], mandatory=False):
+            supportedFlags += [flag]
+
+    self.end_msg (' '.join (supportedFlags))
+    self.env.CXXFLAGS += supportedFlags
+