patch attached:

1.) index is replaced with strchr since index is deprecated
 and not included in mingw32 sdk

2.) -D_WIN32_WINNT=0x0501 is defined to make  getnameinfo work 

3.) errorno is globally defined in mingw32 sdk so it was renamed to errornum

4.) platform specific format tags had to be added since they differ (so it even compiles with -Werror) 
   a.) http://msdn.microsoft.com/en-us/library/fe06s4ak(v=vs.80).aspx
   b.) http://msdn.microsoft.com/en-us/library/tcxf1dw6.aspx (ssize_t)

+#ifdef G_OS_WIN32
+       DEBUG ("fully received %Iu bytes of data", str->len);
+#else
        DEBUG ("fully received %zu bytes of data", str->len);
+#endif

+#ifdef G_OS_WIN32
+       DEBUG ("Append data to buffer of %s (%Iu bytes)", from, str->len);
+#else
        DEBUG ("Append data to buffer of %s (%zu bytes)", from, str->len);
+#endif

Can %zu not just be replaced with G_GSIZE_FORMAT?

http://developer.gnome.org/glib/2.30/glib-Miscellaneous-Macros.html#G-GSIZE-FORMAT:CAPS

+#ifndef ERROR
 #define ERROR(format, ...) \

Where is ERROR being defined already? I'm not sure we want that to be conditional.

+#ifdef G_OS_WIN32
+   strftime (date_str, sizeof (date_str), "%y-%m-%dT%H:%M:%SZ", tm);
+#else
    strftime (date_str, sizeof (date_str), "%FT%H:%M:%SZ", tm);
+#endif

Shouldn't that be %Y instead of %y?

+if WINDOWS
+ AM_CFLAGS += -D_WIN32_WINNT=0x0501
+endif

Can you just add a comment above this documenting what's going on please? It's a bit cryptic.

Then just a few English nits:

+#------------------------------------------------------------
+# Detect Operating system based on --host
+#------------------------------------------------------------

$host, not --host, surely?

+# following flags is requied to make getnameinfo work

s/flags/flag/ and s/requied/required/

Thanks for the review , patch updated :)

replaced zu with G_GSIZE_FORMAT , thanks for the tip.. I didn't know about it before.

+#ifdef G_OS_WIN32
+    strftime (date_str, sizeof (date_str), "%Y-%M-%dT%H:%M:%SZ", tm);
+#else
     strftime (date_str, sizeof (date_str), "%FT%H:%M:%SZ", tm);
+#endif

I don't think this right... "%Y-%M-%dT%H:%M:%SZ"

(In reply to comment #4)
> +#ifdef G_OS_WIN32
> +    strftime (date_str, sizeof (date_str), "%Y-%M-%dT%H:%M:%SZ", tm);
> +#else
>      strftime (date_str, sizeof (date_str), "%FT%H:%M:%SZ", tm);
> +#endif
> 
> I don't think this right... "%Y-%M-%dT%H:%M:%SZ"

oops yes it should be %Y-%m-%d.., now the patch is corrected

Okay then, I merged this, thanks.