lttng-tools dependency missing

I am trying to install lttng-tools and its dependencies into alpine:

apk add userspace-rcu --repository http://nl.alpinelinux.org/alpine/edge/main
apk add lttng-ust-dev --repository http://nl.alpinelinux.org/alpine/edge/main
apk add lttng-tools-dev --repository http://nl.alpinelinux.org/alpine/edge/testing

The lttng-tools install fails with:

ERROR: unsatisfiable constraints:
so:liblttng-ust-ctl.so.2 (missing):
required by:
lttng-tools-2.9.6-r0[so:liblttng-ust-ctl.so.2]
lttng-tools-2.9.6-r0[so:liblttng-ust-ctl.so.2]

I searched for liblttng-ust-ctl.so.2 in the alpine linux packages, but it does not exist.

There are only liblttng-ust-ctl.so.4 in lttng-ust and liblttng-ust-ctl.so in lttng-ust-dev.

Am I doing something wrong or is there a missing dependency?