diff --git a/.waf-tools/default-compiler-flags.py b/.waf-tools/default-compiler-flags.py
index 97921e2..31f070e 100644
--- a/.waf-tools/default-compiler-flags.py
+++ b/.waf-tools/default-compiler-flags.py
@@ -8,20 +8,14 @@
 
 def options(opt):
     opt.add_option('--debug', '--with-debug', action='store_true', default=False, dest='debug',
-                   help='''Compile in debugging mode without all optimizations (-O0)''')
-    opt.add_option('--with-c++11', action='store_true', default=False, dest='use_cxx11',
-                   help='''Enable C++11 mode (experimental, may not work)''')
+                   help='''Compile in debugging mode without optimizations (-O0 or -Og)''')
 
 def configure(conf):
     areCustomCxxflagsPresent = (len(conf.env.CXXFLAGS) > 0)
-    defaultFlags = []
-
-    if conf.options.use_cxx11:
-        defaultFlags += ['-std=c++0x', '-std=c++11']
-    else:
-        defaultFlags += ['-std=c++03', '-Wno-variadic-macros', '-Wno-c99-extensions']
-
-    defaultFlags += ['-pedantic', '-Wall', '-Wno-long-long', '-Wno-unneeded-internal-declaration']
+    defaultFlags = ['-std=c++0x', '-std=c++11',
+                    '-stdlib=libc++',   # clang on OSX < 10.9 by default uses gcc's
+                                        # libstdc++, which is not C++11 compatible
+                    '-pedantic', '-Wall']
 
     if conf.options.debug:
         conf.define('_DEBUG', 1)
@@ -32,6 +26,7 @@
                          '-fdiagnostics-color', # gcc >= 4.9
                          '-Werror',
                          '-Wno-error=maybe-uninitialized', # Bug #1560
+                         '-Wno-error=unneeded-internal-declaration', # Bug #1588
                         ]
         if areCustomCxxflagsPresent:
             missingFlags = [x for x in defaultFlags if x not in conf.env.CXXFLAGS]
@@ -46,12 +41,15 @@
         if not areCustomCxxflagsPresent:
             conf.add_supported_cxxflags(defaultFlags)
 
+    # clang on OSX < 10.9 by default uses gcc's libstdc++, which is not C++11 compatible
+    conf.add_supported_linkflags(['-stdlib=libc++'])
+
 @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')
+    self.start_msg('Checking supported CXXFLAGS')
 
     supportedFlags = []
     for flag in cxxflags:
@@ -60,3 +58,18 @@
 
     self.end_msg(' '.join(supportedFlags))
     self.env.CXXFLAGS = supportedFlags + self.env.CXXFLAGS
+
+@Configure.conf
+def add_supported_linkflags(self, linkflags):
+    """
+    Check which linkflags are supported by compiler and add them to env.LINKFLAGS variable
+    """
+    self.start_msg('Checking supported LINKFLAGS')
+
+    supportedFlags = []
+    for flag in linkflags:
+        if self.check_cxx(linkflags=['-Werror', flag], mandatory=False):
+            supportedFlags += [flag]
+
+    self.end_msg(' '.join(supportedFlags))
+    self.env.LINKFLAGS = supportedFlags + self.env.LINKFLAGS
diff --git a/.waf-tools/websocket.py b/.waf-tools/websocket.py
index 77de373..c5b3384 100644
--- a/.waf-tools/websocket.py
+++ b/.waf-tools/websocket.py
@@ -71,7 +71,7 @@
             Logs.warn('    git submodule init && git submodule update')
             Logs.warn('Otherwise, manually download and extract websocketpp library:')
             Logs.warn('    mkdir websocketpp')
-            Logs.warn('    curl -L https://github.com/zaphoyd/websocketpp/tarball/e203dbed45409111c2e95cb3e4a1d178ee57d2bc > websocket.tar.gz')
+            Logs.warn('    curl -L https://github.com/zaphoyd/websocketpp/tarball/4309749dd98937b8a7be5dc0bfe679ba201c5512 > websocket.tar.gz')
             Logs.warn('    tar zxf websocket.tar.gz -C websocketpp/ --strip 1')
             Logs.warn('Alternatively, WebSocket support can be disabled with --without-websocket')
             self.fatal("The configuration failed")