I'm trying to compile GNUstep on a linux box but gnustep-gui-0.16.0 package is failing. I downloaded GNUstep Startup stable 0.20.1 (http://wwwmain.gnustep.org/resources/downloads.php)and follow instructions about how to compile (./configure && make). I'm getting this error:

libgnustep-gui.so: undefined reference to 'png_sizeof'

I have compiled latest libpng (1.2.34) and I can see that png_sizeof is defined as macro. However, I'm not quite sure how to fix the gnustep-gui-0.16.0 build. I tried to pass the include/lib directory where libpng is installed to configure build but nothing seems to help.

I have quite up to date linux box but using gcc 3.3 (upgrade is not an option - but this should not be a problem).

Full error:

Making all for tool set_show_service...
 Compiling file set_show_service.m ...
 Linking tool set_show_service ...
../Source/./obj/libgnustep-gui.so: undefined reference to `png_sizeof'
collect2: ld returned 1 exit status
gmake[3]: *** [obj/set_show_service] Error 1
gmake[2]: *** [set_show_service.all.tool.variables] Error 2
gmake[1]: *** [internal-all] Error 2
gmake[1]: Leaving directory `/home/bla/local/src/gnustep-startup-0.22.0/build/gnustep-gui-0.16.0'
gmake[3]: *** [obj/set_show_service] Error 1
gmake[2]: *** [set_show_service.all.tool.variables] Error 2
gmake[1]: *** [internal-all] Error 2

Any suggestions? Thanks