[mrtg] Errors going from NT to Linux?

[Nickolas Ray Ellson]

I copied my entire working directories from an NT system to a Linux 
system, both running 2.9.22

When I run mrtg against any of my .cfg files I get.

gd-png:  fatal libpng error: Invalid filter type specified
gd-png error: setjmp returns error condition

And no graphics are built. I tried erasing all .png files and running 
again, but I get the same output. What do I look for next?

Nick

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