did you solve it meanwhile?
i am not using centos but archlinux, and looking at the dependencies of xfce4-screenshooter, i see this:
Code:
depends=('xfce4-panel' 'libsoup' 'hicolor-icon-theme')
makedepends=('xfce4-dev-tools' 'intltool' 'git')
that's for the
git version.
xfce4-panel in turn depends on:
Code:
depends=('exo' 'garcon-devel' 'libxfce4ui' 'libwnck' 'hicolor-icon-theme'
and there's your exo!
mind that the packages will likely have different names on centos, but it should give you a clue.
but maybe it is possible to compile the screenshooter independently from the panel?
you should look at
for available options.