Would need help on setting up a new "Blender" (3D modelling) PPA

[Thomas Schiex]

Dear MOTUs,

I'm trying to set up a new PPA for the fantastic 3D modeller tool
blender. Until mid 2014, IRIE Shinsuke maintained a Blender PPA for
Ubuntu (https://launchpad.net/~irie/+archive/ubuntu/blender). I don't
know what happended to IRIE Shinsuke but the PPA has not chnaged since,
despite the fact that new Blender versions appeared (moved from 2.71 to
2.73 with several new features).

I have been trying to set up a mirror of IRIE's PPA and then update
Blender sources to move forward. But because of the intricacy of Blender
compilation (it depends on a very large number of external software and
libraries which must have precise versions), I have been unable to
achieve this. I have been through several issues but I now have an error
that I simply don't understand.

The Build log is here:

https://launchpadlibrarian.net/193587948/buildlog_ubuntu-utopic-amd64.openshadinglanguage_1.5.0-0thomas~utopic0_FAILEDTOBUILD.txt.gz

It says that

    The following packages have unmet dependencies:
     libopenexr-dev : Depends: libopenexr21 (= 2.1.0-thomas~utopic0) but
    it is not going to be installed
    E: Unable to correct problems, you have held broken packages.
    apt-get failed.

The packages libopenexr-dev and libopenser21 are provided by the setup
PPA. I have all those packages installed on my computer with no issue at
all, and with a successful debuild. The dependencies of libopenexr21 (=
2.1.0-thomas~utopic0) are very limited so I cannot see what prevents
installation:

    Depends on: libc6 (>=2.14), libgcc1 (>= 1:4.1.1), libilmbase11 (>=
    2.1.0),
                libstdc++ (>=4.9), zlib1g (>=1:1.1.4)
    PreDepends: multiarch-support
    Replaces: libopenexr (< 2.1.0-thomas~utopic0)
    Breaks: libopenexr21 (!=2.1.0-thomas~utopic0)

I have spent quite a time but I fail to understand what is the issue. I
thought a fresh eye (and brain) could help. The whole PPA is accessible
here:

https://launchpad.net/~thomas-schiex/+archive/ubuntu/blender

Thomas
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