Bug#51437: emacs20 installation fails

[masik@darbujan.fzu.cz]

Package: dpkg-dev
Version: 1.6.1

Hello,

emacs20 (Version: 20.4-2) installation fails with the following error

install/dpkg-dev: Byte-compiling for emacs20
cp: debian-changelog-mode.el: No such file or directory
emacs-install: /usr/lib/emacsen-common/packages/install/emacsen-common-install~ emacs20 failed at /usr/lib/emacsen-common/emacs-install line 28.
dpkg: error while cleaning up:
 subprocess post-installation script returned error exit status 29
Errors were encountered while processing:
 /data/masik/debian/archives/emacs20_20.4-2_i386.deb

I believe the error is in the script
dpkg-dev: /usr/lib/emacsen-common/packages/install/emacsen-common-install
which attemps to copy debian-changelog-mode.el from 
ELDIR=/usr/share/emacs/site-lisp/${PACKAGE}
files="debian-changelog-mode.el"

if [ ${FLAVOR} != emacs ]; then
  echo install/${PACKAGE}: Byte-compiling for ${FLAVOR}

  install -m 755 -d ${ELCDIR}
  cd ${ELDIR}
  cp ${files} ${ELCDIR}


debian-changelog-mode.el is in
dpkg-dev: /usr/share/dpkg/site-lisp/dpkg/debian-changelog-mode.el

        Jiri