MinGW build - code seems to ignore #if statements in winres.rc

[emendelson]

In the VS builds, I know that I can specify which icon file to use in vs\winres.rc, and I can modify the file to test #if SOMEDEF, then use a specific icon file.

But when I build in MinGW, the build seems to ignore #if statements that I add to the winres.rc code and simply uses the last icon file that it finds. Is there some way to make it test the #if statements when used in MinGW?