lost icons in gtk app

[Lev]

I recently installed (from source) an EDA software (gEDA) on my FreeBSD
VM. When I run it the application specific icons are not shown. I
think it is GTK related. The icons are installed in /opt/share/icons. I
have the same result if I install it to /usr/local/icons.

How can I make the 'system' find my icons?

If you want I can send a screenshoot.

Thanks,
Levente