png app icons not working?

[Sebastian Reitenbach]

Hi,

I'm on OpenBSD amd64, latest gnustep core releases installed, compiled with 
clang, non-fragile-abi.

I have the following png installed: 
png-1.6.6

configure stage of -gui is checking and finding png:
checking for libpng-config... yes
checking png.h usability... yes
checking png.h presence... yes
checking for png.h... yes
checking for png_sig_cmp in -lpng... yes
...

and its also linked against it.

I tried Camera from the gsimageapps:
http://home.gna.org/gsimageapps/

and I found that the app icon is a png. When the application starts, then
in the app icon, and in the Info panel, I only see a white square, instead
of the camera icon. I used gimp to resave the Camera.png as Camera.tif
and tweaked the GNUMakefile to use the tif instead. With the tif I see the
expected Camera icon.

Now I'm wondering what the actual problem is, something in my setup,
something more general problem in -gui? Since this Camera is a relatively
old app, I guess it must have worked at some point in time with the png
image too?

cheers,
Sebastian