I've successfully compiled Radiance using Cygwin on
Here is a link to the web page from where you
can download the cygwin Radiance executables:
There is also a short description about what to change in
the makeall script and Rmakefiles to have everything compiled,
and some snapshots of my window$/cygwin/radiance desktop.
Please notice that the binaries only work in the cygwin environment,
so it is necessary to install cygwin and Xfree86/Cygwin from: