Now I see the root of the unfold-help.pd issue, zexy relies on symlinks that are checked into svn. That'll work fine on UNIX, but is very unpredictable in Windows. For example, a Windows svn client might check them out by copying them. A cygwin svn client might check them out directly, but then cygwin has its own symlink format which is compatible with Windows shortcuts. Then MinGW does not have a native SVN client packaged, so if you will get different results depending on whether you use a Windows or Cygwin svn client in MinGW.
I think the build system should create the links using $(LN_S). That will work in a consistent fashion in all of the above situations. On Windows/MinGW, it'll always copy, on Cygwin it'll make the special Cygwin symlinks, and on UNIX it'll make standard symlinks.
.hc