build errors on Visual C++ 2005 (unix/multicast.c)

I'm having difficulties building Apache 2.2.6 for Windows. I am compiling
using Visual C++ 2005 Express, and I have followed all the instructions here
>>> http://httpd.apache.org/docs/2.0/platform/win_compiling.html

I run into the following errors:

1>.\network_io\unix\multicast.c(137) : error C2079: 'mip' uses undefined
struct 'group_source_req'
1>.\network_io\unix\multicast.c(168) : error C2224: left of '.gsr_interface'
must have struct/union type
1>.\network_io\unix\multicast.c(168) : warning C4013: 'find_if_index'
undefined; assuming extern returning int

......

Is it trying to build Unix-specific files that should be ignored on the
Win32 platform?

I get the same errors regardless of whether I build from the command line or
IDE, and whether I do a debug or release build. Please advise!

Thanks in advance.