port-i386/45026: libpng crashes in links -g and other browsers

[nbsdold%gmx.net@localhost]

>Number:         45026
>Category:       port-i386
>Synopsis:       libpng crashes in links -g and other browsers
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jun 05 17:20:01 +0000 2011
>Originator:     Nino
>Release:        5.1
>Organization:
home user
>Environment:
custom kernel
>Description:
There are core dumps left and right from chimera and links-gui when trying to 
visit graphics-containing sites, such as www.gmx.net or logging in to 
m.facebook.com. - It does NOT crash on www.google.com, where the pictures of 
Google are shown. The error message I get on the console is:

libpng error: fixed point overflow in rgb to gray screen coefficient



>How-To-Repeat:
try to login with links-gui to m.facebook.com, using links' graphic switch.
>Fix: