As pointed by someone somewhere on this project site,
the INSTALL explains how to compile for Windows, but
does not mention what files are needed for redistribution.
My guess, based on the fact that two of each exe are
created, is that there are both static and dynamic
versions, and if you link against the dynamic version
you will need to redistribute curses.dll. Also, testing
the xmas.exe and xmas_dll.exe seems to confirm that
only the latter requires curses.dll to be present.
This should be documented somewhere, either in the
win32 area of the main INSTALL file, or perhaps in a
new file REDISTRIBUTION in the win32 subdirectory?