$ znc-buildmod awaynick.cpp
Building "awaynick.so" for ZNC 1.6.0... In file included from awaynick.cpp:18:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/IRCSock.h:21:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/Socket.h:21:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/Csocket.h:43:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/defines.h:24:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/ZNCDebug.h:21:
/usr/local/Cellar/znc/1.6.0/include/znc/ZNCString.h:60:6: warning: scoped enumerations are a C++11
      extension [-Wc++11-extensions]
enum class CaseSensitivity {
     ^
/usr/local/Cellar/znc/1.6.0/include/znc/ZNCString.h:85:47: error: 'CaseSensitivity' is not a class,
      namespace, or scoped enumeration
        static const CaseSensitivity CaseSensitive = CaseSensitivity::CaseSensitive;
                                                     ^
/usr/local/Cellar/znc/1.6.0/include/znc/ZNCString.h:86:49: error: 'CaseSensitivity' is not a class,
      namespace, or scoped enumeration
        static const CaseSensitivity CaseInsensitive = CaseSensitivity::CaseInsensitive;
                                                       ^
In file included from awaynick.cpp:18:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/IRCSock.h:21:
/usr/local/Cellar/znc/1.6.0/include/znc/Socket.h:32:121: warning: 'override' keyword is a C++11
      extension [-Wc++11-extensions]
  ...* pAddr, socklen_t iAddrLen, CS_STRING & sIP, u_short * piPort) const override;
                                                                           ^
/usr/local/Cellar/znc/1.6.0/include/znc/Socket.h:34:72: warning: 'override' keyword is a C++11
      extension [-Wc++11-extensions]
        int VerifyPeerCertificate(int iPreVerify, X509_STORE_CTX * pStoreCTX) override;
                                                                              ^
/usr/local/Cellar/znc/1.6.0/include/znc/Socket.h:35:30: warning: 'override' keyword is a C++11
      extension [-Wc++11-extensions]
        void SSLHandShakeFinished() override;
                                    ^
In file included from awaynick.cpp:19:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/IRCNetwork.h:24:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/znc.h:22:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/Modules.h:21:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/WebModules.h:22:
/usr/local/Cellar/znc/1.6.0/include/znc/HTTPSock.h:59:30: warning: 'override' keyword is a C++11
      extension [-Wc++11-extensions]
        CString GetRemoteIP() const override;
                                    ^
In file included from awaynick.cpp:19:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/IRCNetwork.h:24:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/znc.h:22:
In file included from /usr/local/Cellar/znc/1.6.0/include/znc/Modules.h:21:
/usr/local/Cellar/znc/1.6.0/include/znc/WebModules.h:124:20: warning: 'override' keyword is a C++11
      extension [-Wc++11-extensions]
        bool ForceLogin() override;
                          ^
/usr/local/Cellar/znc/1.6.0/include/znc/WebModules.h:125:72: warning: 'override' keyword is a C++11
      extension [-Wc++11-extensions]
        bool OnLogin(const CString& sUser, const CString& sPass, bool bBasic) override;
                                                                              ^
/usr/local/Cellar/znc/1.6.0/include/znc/WebModules.h:126:42: warning: 'override' keyword is a C++11
      extension [-Wc++11-extensions]
        void OnPageRequest(const CString& sURI) override;
                                                ^
8 warnings and 2 errors generated.
[ !! ] Error while building "awaynick.so"