Using latest ghostscript ebuild

Hi!

I downloaded a new ebuild for ghostscript that fixes a bug related to
copying font files during ghostscript 7.05 install. Doing

emerge ghostscript-7.05.4.ebuild

from within "/usr/portage/app-text/ghostscript" leads to the following
messages

Calculating dependencies \portage: aux_get(): (1) couldn't open cache
entry for
app-text/ghostscript-7.05.4
(likely caused by syntax error or corruption in the
app-text/ghostscript-7.05.4
ebuild.)
emerge: create(): aux_get() error on
app-text/ghostscript-7.05.4; aborting...

(I simply grabbed the ebuild from the bugzilla bug page and copied it to
the aforementioned location.) Why doesn't this approach work? Am I missing
something?

Thanks in advance for any help!

Kind regards,

	Holger