Path of tool-bar icons

[Mick Bert]

Hello
Working on a RHEL host machine, administrators  installed emacs from a
subset of official repository (i don't know have many details about it),
version:

  GNU Emacs 24.3.1 (x86_64-redhat-linux-gnu,
  GTK+ Version 3.22.10) of 2017-09-12
  on x86-017.build.eng.bos.redhat.com

When I run it, it does not display any icon in the toolbar. Icons are at
path:

  /usr/share/emacs/24.3/etc/images

How can I know where emacs is looking for icons, or possibly change such
path?

--
Mick