File strio.h near line 45
=========================
Errors when NDEBUG already defined.  Replace with:

#ifndef DEBUG
#ifndef NDEBUG
# define NDEBUG
#endif
#endif


File win32config.h near line 24
==============================
Missing: #define EINTR WSAEINTR

File nanoHttp.c near line 407
============================
EAGAIN is undefined in win32

Fix using #ifdefined(EAGAIN) as in previous version of libxml:

static int
xmlNanoHTTPSend(xmlNanoHTTPCtxtPtr ctxt, const char * xmt_ptr, int outlen) 
{

    int 	total_sent = 0;

    if ( (ctxt->state & XML_NANO_HTTP_WRITE) && (xmt_ptr != NULL ) ) {
        while (total_sent < outlen) {
            int nsent = send(ctxt->fd, xmt_ptr + total_sent,
                                      outlen - total_sent, 0);
            if (nsent>0)
                total_sent += nsent;
#if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
		    else if ( ( nsent == -1 ) && 
		    	      ( socket_errno( ) != EAGAIN ) &&
			        ( socket_errno( ) != EWOULDBLOCK ) ) {
#else
		    else if ( ( nsent == -1 ) && 
		        ( socket_errno( ) != EWOULDBLOCK ) ) {
#endif
	        xmlGenericError( xmlGenericErrorContext,
				"xmlNanoHTTPSend error:  %s",
				strerror( socket_errno( ) ) );

		if ( total_sent == 0 )
		    total_sent = -1;
		break;
	    }