Package not found in Vala API or GObject-Introspection GIR directories

[Andreas Enge]

Hello,

the attached package fails to build with the following error message:
Making all in datahub
make[2]: Entering directory 
'/tmp/nix-build-zeitgeist-0.9.14.drv-0/build/datahub'
/gnu/store/lrqwgyq5m29pgjrzs6g3wjicm2v4pwii-vala-0.26.1/bin/valac \
        --target-glib=2.26 --pkg gio-2.0 --pkg gio-unix-2.0 --pkg gtk+-3.0 
--pkg json-glib-1.0 ../libzeitgeist/zeitgeist-datamodel-2.0.vapi 
../libzeitgeist/zeitgeist-2.0.vapi ../../zeitgeist-0.9.14/config.vapi 
../../zeitgeist-0.9.14/datahub/glib-extra.vapi -C  --pkg telepathy-glib \
        ../../zeitgeist-0.9.14/datahub/data-provider.vala 
../../zeitgeist-0.9.14/datahub/desktop-launch-listener.vala 
../../zeitgeist-0.9.14/datahub/downloads-directory-provider.vala 
../../zeitgeist-0.9.14/datahub/kde-recent-document-provider.vala 
../../zeitgeist-0.9.14/datahub/recent-manager-provider.vala 
../../zeitgeist-0.9.14/datahub/utils.vala 
../../zeitgeist-0.9.14/datahub/zeitgeist-datahub.vala 
../../zeitgeist-0.9.14/datahub/telepathy-observer.vala
error: Package `telepathy-glib' not found in specified Vala API directories or 
GObject-Introspection GIR directories

A search revealed that this might have to do with XDG_DATA_DIRS, so I added
glib as an input to obtain the XDG_DATA_DIRS environment variable.
The variable contains
   /gnu/store/hmkj0ynb9qc7fypd4ivkiqqmmzdxhycl-telepathy-glib-0.24.1/share
with a subdirectory gir-1.0 containing a file TelepathyGLib-0.12.gir.

Does anyone more knowledgeable in this matter have an idea on what goes wrong?

Andreas

zeitgeist.scm
Description: Text document