bitbake -e glib-2.0 | grep glib-2.0
PREFERRED_VERSION_glib-2.0="2.12.10"

bitbake -D -D -D glib-2.0 | grep glib-2.0
DEBUG: parsing /home/leon/sandbox/openembedded/org.openembedded.dev/packages/glib-2.0/glib-2.0_2.12.10.bb
DEBUG: skipping /home/leon/sandbox/openembedded/org.openembedded.dev/packages/glib-2.0/glib-2.0_2.12.10.bb
DEBUG: No providers of build target glib-2.0 (for [])
ERROR: No providers of build target glib-2.0 (for [])