Failure on export-orig in dynare

[Rafael Laboissière <rafael@debian.org>]

Him

I cannot export the upstream tarball in a freshly cloned directory for 
package dynare:

    $ gbp clone git@salsa.debian.org:pkg-octave-team/dynare.git
    gbp:info: Cloning from 'git@salsa.debian.org:pkg-octave-team/dynare.git'
    $ cd dynare
    $ gbp export-orig
    gbp:info: Creating /var/data/rlaboiss/debian/PKGS/dynare/dynare_6.0.orig.tar.xz
    gbp:error: Error creating dynare_6.0.orig.tar.xz: Pristine-tar couldn't checkout "dynare_6.0.orig.tar.xz": xdelta3: source file too short: XD3_INVALID_INPUT
    xdelta3: normally this indicates that the source file is incorrect
    xdelta3: please verify the source file with sha1sum or equivalent
    xdelta3: source file too short: XD3_INVALID_INPUT
    xdelta3: normally this indicates that the source file is incorrect
    xdelta3: please verify the source file with sha1sum or equivalent
    xdelta3: source file too short: XD3_INVALID_INPUT
    xdelta3: normally this indicates that the source file is incorrect
    xdelta3: please verify the source file with sha1sum or equivalent
    xdelta3: source file too short: XD3_INVALID_INPUT
    xdelta3: normally this indicates that the source file is incorrect
    xdelta3: please verify the source file with sha1sum or equivalent
    xdelta3: target window checksum mismatch: XD3_INVALID_INPUT
    xdelta3: normally this indicates that the source file is incorrect
    xdelta3: please verify the source file with sha1sum or equivalent
    xdelta3: source file too short: XD3_INVALID_INPUT
    xdelta3: normally this indicates that the source file is incorrect
    xdelta3: please verify the source file with sha1sum or equivalent
    pristine-tar: Failed to reproduce original tarball. Please file a bug report.
    pristine-tar: failed to generate tarball

Any hints?

Best,

Rafael