Mark reported on IRC that gnome-session, as of v0.11.0-1639-g34f9582, refers to the grafted “out” of glib, but at the same time refers to the *ungrafted* “bin” output of glib: --8<---------------cut here---------------start------------->8--- $ ./pre-inst-env guix build gnome-session /gnu/store/rchskrbc42yjlb85lq8zigpvynwc2zz7-gnome-session-3.20.2 $ guix gc -R /gnu/store/rchskrbc42yjlb85lq8zigpvynwc2zz7-gnome-session-3.20.2|grep glib-2 /gnu/store/l1s4cw9g58hmcpd2qgbckfl228143qzx-glib-2.48.0 /gnu/store/c4rjjznraqnw7wk7zwr8ndmq7bdmj51q-glib-2.48.0-bin $ ./pre-inst-env guix build glib /gnu/store/ya5d1r6bvph3m5nisjywrnkvffpdrjfn-glib-2.48.0-bin /gnu/store/jav2d6c39k3amv4k1670845li7284a6q-glib-2.48.0-doc /gnu/store/77f9q6kvgrrwhqbzxzc10bwdwq6kd690-glib-2.48.0 $ ./pre-inst-env guix build glib --no-grafts /gnu/store/c4rjjznraqnw7wk7zwr8ndmq7bdmj51q-glib-2.48.0-bin /gnu/store/ib12bfrx83aawhabpp0rijgmm61gi0wg-glib-2.48.0-doc /gnu/store/l1s4cw9g58hmcpd2qgbckfl228143qzx-glib-2.48.0 --8<---------------cut here---------------end--------------->8--- Ludo’.