Bug#856966: Uninstallable on sid

[Yuri D'Elia <wavexx@thregr.org>]

Package: libcore-ocaml-dev
Severity: normal

I was trying to install libcore-ocaml-dev, but multiple dependencies are
currently unavailable, making the package uninstallable:

https://packages.debian.org/sid/libcore-ocaml-dev

-- System Information:
Debian Release: 9.0
 APT prefers unstable
 APT policy: (900, 'unstable'), (800, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)