[CentOS] ld issue

I have an annoying little issue that perhaps someone can explain to me.

I installed zenoss (very cool, http://www.zenoss.org) and things are OK.

when I use emacs or when somethings like a cron job execute, I get
notice of an error...

emacs: /opt/zenoss/lib/libpng12.so.0: no version information available
(required by emacs)
or
/usr/bin/webalizer: /opt/zenoss/lib/libpng12.so.0: no version
information available (required by /usr/lib/libgd.so.2)

doing my google bit, I seem to find that this isn't a necessarily a
zenoss problem but rather a problem caused by all sorts of software that
install a version of the libpng12.so

is there some method of fixing this using ld ?

Craig