Public bug reported:

When i try to install camlp4-extra, I get the following error

>    > sudo apt-get install camlp4-extra
>    Reading package lists... Done
>    Building dependency tree       
>    Reading state information... Done
>    Some packages could not be installed. This may mean that you have
>    requested an impossible situation or if you are using the unstable
>    distribution that some required packages have not yet been created
>    or been moved out of Incoming.
>    The following information may help to resolve the situation:
>
>    The following packages have unmet dependencies:
>     camlp4-extra : Depends: ocaml-nox-3.12.1
>                    Depends: camlp4-3.12.1
>    E: Unable to correct problems, you have held broken packages.

However, neither of these packages are available. In fact, I already do
have ocaml-nox and camlp4 installed.

>    > dpkg -s ocaml-nox
>    Package: ocaml-nox
>    Status: install ok installed
>    Priority: optional
>    Section: ocaml
>    Installed-Size: 25711
>    Maintainer: Debian OCaml Maintainers <debian-ocaml-ma...@lists.debian.org>
>    Architecture: amd64
>    Source: ocaml
>    Version: 4.01.0-1ppa4~raring
>    Replaces: ocaml-interp (<< 3.11.1-3)
>    Provides: libnums-ocaml-dev, ocaml-nox-4.01.0
>    Depends: ocaml-base-nox, libc6 (>= 2.15), libtinfo5, zlib1g (>= 1:1.2.0), 
> ocaml-base-nox-4.01.0, libncurses5-dev, ocaml-interp (= 4.01.0-1ppa4~raring), 
> gcc, binutils
>    Recommends: camlp4, file
>    Suggests: ocaml-doc, tuareg-mode | ocaml-mode
>    Breaks: camlidl (<< 1.04), camlp4 (<< 3.10.0), dh-ocaml (<< 1.0.0), 
> ocaml-interp (<< 3.11.1-3)
>    Description: ML implementation with a class-based object system (no X)
>     Objective Caml (OCaml) is an implementation of the ML language, based on
>     the Caml Light dialect extended with a complete class-based object system
>     and a powerful module system in the style of Standard ML.
>     .
>     OCaml comprises two compilers. One generates bytecode
>     which is then interpreted by a C program. This compiler runs quickly,
>     generates compact code with moderate memory requirements, and is
>     portable to essentially any 32 or 64 bit Unix platform. Performance of
>     generated programs is quite good for a bytecoded implementation:
>     almost twice as fast as Caml Light 0.7. This compiler can be used
>     either as a standalone, batch-oriented compiler that produces
>     standalone programs, or as an interactive, toplevel-based system.
>     .
>     The other compiler generates high-performance native code for a number
>     of processors. Compilation takes longer and generates bigger code, but
>     the generated programs deliver excellent performance, while retaining
>     the moderate memory requirements of the bytecode compiler. It is not
>     available on all arches though.
>     .
>     This package contains everything needed to develop OCaml applications
>     that do not require the graphics library.
>    Homepage: http://caml.inria.fr/

>    > dpkg -s camlp4
>    Package: camlp4
>    Status: install ok installed
>    Priority: optional
>    Section: ocaml
>    Installed-Size: 70556
>    Maintainer: Debian OCaml Maintainers <debian-ocaml-ma...@lists.debian.org>
>    Architecture: amd64
>    Source: ocaml
>    Version: 4.01.0-1ppa4~raring
>    Provides: camlp4-4.01.0
>    Depends: libc6 (>= 2.15), ocaml-nox-4.01.0
>    Description: Pre Processor Pretty Printer for OCaml
>     Objective Caml (OCaml) is an implementation of the ML language,
>     based on the Caml Light dialect extended with a complete
>     class-based object system and a powerful module system in the
>     style of Standard ML.
>     .
>     CamlP4 is a Pre-Processor-Pretty-Printer for Objective Caml. It
>     offers tools for syntax (Stream Parsers and Grammars) and the
>     ability to modify the concrete syntax of the language
>     (Quotations, Syntax Extensions).
>     .
>     This package contains the basic CamlP4 executables and libraries
>     for pre-processing and pretty-printing OCaml sources both
>     interactively and in a batch fashion.
>    Homepage: http://caml.inria.fr/

** Affects: ocaml (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1258957

Title:
  camlp4-extra depends on non existant packages

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