What's the appropriate Makefile-fu to change someport.conf to someport.conf.sample?

[Pete Fritchman]

* Mon, 22 Dec 2003 17:11:59 CST - Tillman Hodgson:
| Is the following acceptable practice?
| 
| pre-configure:
| 	@${CP} ${WRKSRC}/latd.conf ${WRKSRC}/latd.conf.sample
| 	@${SED} -i .dist -e 's/sysconf_DATA = latd.conf/sysconf_DATA = latd.con
| f.sample/' ${WRKSRC}/Makefile.in

USE_REINPLACE=	yes
[...]
post-patch:
	@${REINPLACE_CMD} -e 's/foo/bar/' ${WRKSRC}/Makefile.in

This is a good start.  But there's more to config file management; it'd
be good form to install both latd.conf + latd.conf.sample.  Upon deinstall,
cmp latd.conf and latd.conf.sample -- if they're the same, remove latd.conf,
if not - leave the user's customizations.  On install, check if latd.conf
exists (think a custom config from a previous install) -- if not, install
the .sample one.

Like I said, the editors/joe-devel port provides (what I think is) a good
example.

Thanks,

--pete