CVS overwrite on merge fail?

I was wondering if there is a way in CVS
to tell it to kill my local copy of a file
if there is a problem with merge?  I didn't
change or patch these files, but every once
and a while something like this happens:

-------------------------------------------------
P src/backend/parser/analyze.c
RCS file: /usr/local/cvsroot/pgsql/src/backend/parser/gram.c,v
retrieving revision 2.71
retrieving revision 2.73
Merging differences between 2.71 and 2.73 into gram.c
rcsmerge: warning: conflicts during merge
cvs server: conflicts found in src/backend/parser/gram.c
C src/backend/parser/gram.c
----------------------------------------------------------------

any suggestions woudl be way cool.

Thank you
ClarkEvans
clark.evans@manhattanproject.com