auto-save-directory-fallback vs. binary kits

I've gotten reports from people who have downloaded my prebuilt XEmacs for WinNT that there are problems related to autosaving. The variable "auto-save-directory-fallback" is getting set to "C:\\cgw\\.autosave", which creates problems.... auto-save.el has this code: (defvar auto-save-directory-fallback (expand-file-name "~/.autosave/") The expansion of "~" seems to be getting done at compile-time rather than run-time, so people who download my binary kit get stuck with my value of "~". How are people who build binary kits dealing with this issue?