I would download/install the latest version of libpng (zlib and gd too) and then
point the mrtg ./configure command to those downloaded source trees.

 ./configure --prefix=/usr/local/mrtg-2                    --with-gd=/usr/local/src/gd              
     --with-z=/usr/local/src/zlib                  --with-png=/usr/local/src/libpng

> -----Original Message-----
> From: owner-kclug@marauder.illiana.net
> [mailto:owner-kclug@marauder.illiana.net]On Behalf Of mike neuliep
> Sent: Tuesday, September 03, 2002 12:24 PM
> To: kclug@kclug.org
> Subject: mrtg problems
>
>
>
> Hello,
>
> I have the latest version of mrtg installed on a Caldera systems and
> I get this
> error when running mrtg:
>
> gd-png:  fatal libpng error: Invalid filter type specified
> gd-png error: setjmp returns error condition
>
> Has anyone seen this before?  Does anyone know how to configure png filters?
> I'm clueless when it comes to this...
>
> 	Mike
>
>