Hi Ludo,
Please try to upgrade your system and your user profile to see if anything’s wrong for you (I did that a few days ago and I’m happy!).
It mostly works fine for me, except that the build of next-gtk-webkit fails (which works fine on master). The cause is:
make[2]: Entering directory '/tmp/guix-build-webkitgtk-2.26.1.drv-0/build'make[2]: *** No rule to make target 'JavaScriptCore-4.0.gir', needed by 'WebKit2-4.0.gir'. Stop.
Konrad.
