petrie:~/dev-src/pkgconf$ ./pkgconf --maximum-traverse-depth=1 --cflags --libs 'audacious'
-I/usr/include -L/usr/lib -laudcore -laudgui
petrie:~/dev-src/pkgconf$ ./pkgconf --maximum-traverse-depth=2 --cflags --libs 'audacious'
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  -pthread -I/usr/include/gtk-2.0  -I/usr/include/pango-1.0 -I/usr/include/cairo -I/usr/include/libmowgli -I/usr/include -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/dbus-1.0 -I/usr/include -L/usr/lib -lglib-2.0 -lintl  -L/usr/lib -lgthread-2.0 -pthread  -L/usr/lib -lgtk-x11-2.0  -L/usr/lib -lpango-1.0  -L/usr/lib -lcairo -L/usr/lib -lmowgli -L/usr/lib -lmcs -L/usr/lib -ldbus-1 -lpthread -lrt  -L/usr/lib -ldbus-glib-1 -L/usr/lib -laudcore -laudgui
petrie:~/dev-src/pkgconf$ ./pkgconf --maximum-traverse-depth=3 --cflags --libs 'audacious'
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  -pthread -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include  -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0   -I/usr/include/pango-1.0 -I/usr/include/gtk-2.0  -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include   -pthread -I/usr/include/pango-1.0 -I/usr/include/cairo -I/usr/include/libmowgli -I/usr/include/libmowgli -I/usr/include -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include   -I/usr/include/dbus-1.0 -I/usr/include -L/usr/lib -lglib-2.0 -lintl  -L/usr/lib -lglib-2.0 -lintl  -L/usr/lib -lgthread-2.0 -pthread  -L/usr/lib -lgdk-x11-2.0  -L/usr/lib -latk-1.0 -L/usr/lib -lcairo -L/usr/lib -lgdk_pixbuf-2.0  -lm  -L/usr/lib -lgio-2.0 -L/usr/lib -lpangoft2-1.0 -L/usr/lib -lgtk-x11-2.0  -L/usr/lib -lglib-2.0 -lintl  -L/usr/lib -lgobject-2.0 -L/usr/lib -lgmodule-2.0 -pthread  -L/usr/lib -lpango-1.0  -L/usr/lib -lcairo -L/usr/lib -lmowgli -L/usr/lib -lmowgli -L/usr/lib -lmcs -L/usr/lib -ldbus-1 -lpthread -lrt  -L/usr/lib -ldbus-1 -lpthread -lrt  -L/usr/lib -lglib-2.0 -lintl  -L/usr/lib -lgobject-2.0 -L/usr/lib -ldbus-glib-1 -L/usr/lib -laudcore -laudgui