was utf8 deprecated or removed from glib?

[Angelica Perduta <rsperduta gmail com>]

trying to build a project from back in 2010 and getting all my utf8
related calls flagged as undefined. i.e:

undefined reference to `g_utf8_get_char'
undefined reference to `g_unichar_to_utf8'
undefined reference to `g_utf8_validate'
undefined reference to `g_utf8_skip'

I'm using the following:
`pkg-config --cflags --libs gtk+-2.0 gmodule-2.0 gtkmm-2.4 glib-2.0`

Well it used to compile and link so I'm hoping someone here can shed
some light on what could have happened... I've searched high and low
:|