In the makefile, add the file BULLSEYE.CUR to the list of files on which CURSOR.RES is dependent. The relevant lines in the makefile should look like this:
cursor.res: cursor.rc cursor.h bullseye.cur
rc /r cursor.rc
This change ensures that, if the file BULLSEYE.CUR changes, CURSOR.RC will be recompiled to form a new CURSOR.RES file.