re-compiling package twice errors out

[Andreas Leha <andreas.leha@med.uni-goettingen.de>]

Dear all,

I am re-compiling xscreensaver.

Re-compiling once works fine:

    apt-get source xscreensaver
    cd xscreensaver-6.0.6+dfsg1
    LANG=C debuild -us -uc


Re-compiling a second time errors out, though:

    > LANG=C debuild -us -uc
    .... (skipped lines)
    dpkg-source: info: using source format '3.0 (quilt)'
    dpkg-source: info: building xscreensaver using existing ./xscreensaver_6.06+dfsg1.orig.tar.xz
    dpkg-source: info: using patch list from debian/patches/series
    dpkg-source: error: cannot represent change to hacks/fonts/OCRAStd.otf: binary file contents changed
    dpkg-source: error: add hacks/fonts/OCRAStd.otf in debian/source/include-binaries if you want to store the modified binary in the debian
     tarball
    dpkg-source: warning: newly created empty file 'po/.intltool-merge-cache.lock' will not be represented in diff
    dpkg-source: error: unrepresentable changes to source
    dpkg-buildpackage: error: dpkg-source -b . subprocess returned exit status 1
    debuild: fatal error at line 1182: 
    dpkg-buildpackage -us -uc -ui failed


What am I missing here?

Thanks in advance.
Andreas