gui linking problem

[Riccardo]

Hi,
after the fixes of NSAnimation and some other small stuff I fixed 
myself, gui compilation on my older box fails with:

 Compiling file set_show_service.m ...
 Linking tool set_show_service ...
/usr/bin/ld: warning: type and size of dynamic symbol 
`__objc_class_name_NSProcessInfo' are not defined
/usr/bin/ld: warning: type and size of dynamic symbol 
`__objc_class_name_NXConstantString' are not defined
/usr/bin/ld: warning: type and size of dynamic symbol 
`__objc_class_name_NSAutoreleasePool' are not defined
../Source/./obj/libgnustep-gui.so: undefined reference to `png_sizeof'
collect2: ld returned 1 exit status
make[2]: *** [obj/set_show_service] Error 1
make[1]: *** [set_show_service.all.tool.variables] Error 2
make[1]: Leaving directory `/home/multix/gnt/gnustep-gui-0.13.0/Tools'
make: *** [internal-all] Error 2
address@hidden gnustep-gui-0.

is png_sizeof something that hsould be provided by my png library?

I still have installed:

libpng-devel-1.2.5-1
libpng-1.2.5-1


which used to be enough up to the past release I compiled... I thought 
that versions differing by minor release numbers were all OK.

is an update mandatory or is something else wrong?

-Riccardo