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For the time being, we suggest using the forked version (now called log4shib), which builds properly on all supported Shibboleth platforms. The dependent projects all build cleanly with either logging library, but you must use the same one throughout your build, obviously.
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To actually determine whether this results in a correct build, you'd have to examine the compiler flags that get used and you'd have to know what they should look like on that platform. If you can't do this, my advice is don't use this package and use log4shib.
Windows
The source distribution includes broken Visual Studio 6.0 project files that have not been maintained. It may build with some effort.