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Subject: Re: DJGGP 2.05 upgrade problems. (appologies)
From: "RayeR (glaux AT centrum DOT cz)" <djgpp AT delorie DOT com>
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Well I fixed the problem by adding proper #ifdef around IPV6 function in pcconfig.c

line 150
#if defined(USE_IPV6)
  FUNC_TO_W32CALL (ReadHosts6File)
#endif

line 808
#if defined(USE_IPV6)
       { "HOSTS6",        ARG_FUNC,   (void*)_ReadHosts6File    },
#endif

And now it linked successfully.
BTW the wattcp uset in Q2DOS have enabled 
#define USE_BSD_API     /* Include BSD-sockets */ // FS: Libcurl needs this
in config.h because of curl so I enabled it in your config too.