i compile and package venenux release of pcmanfm with valac 0.12 and glib 2.24, but configure said must be valac 0.13 as minimun and glib 2.26 (wich depends on gobject-2.0 2.26 +)
i revised before compiled, code and in libfm theres no lines for gobject instrocpection,an valac its only used for stupid thing, so i suggest for LIGHT DEKSTOP (that its only usefully in older machines thaaattt dont have too high software installled) reduce and modified code..
i think developer use windoze like distributions that install too high software for "light" dekstop.. and the autotools generate unused depdns (obviously produced by valac release instaled)
so before send this report i test enough the binaries and works as well, and problems i found are not related to valac or gobject (that its not used for any runtime operation of course hum)
as i said:
there's no fun in a light desktop (software) if required a high dektops (hardware)...