$ mising_debian_pkgs="libffi-dev libxcb-dri2-0-dev libxcb-xfixes0-dev libpoppler-glib-dev libx11-xcb-dev"

$ echo $mising_debian_pkgs 
libffi-dev libxcb-dri2-0-dev libxcb-xfixes0-dev libpoppler-glib-dev libx11-xcb-dev

$ for i in $mising_debian_pkgs ; do LC_ALL=C apt-cache policy $i ; done

libffi-dev:
  Installed: 3.0.9-3
  Candidate: 3.0.9-3
  Version table:
 *** 3.0.9-3 0
        500 http://ftp.debian.org/debian/ sid/main i386 Packages
        500 http://ftp2.de.debian.org/debian/ sid/main i386 Packages
        100 /var/lib/dpkg/status

libxcb-dri2-0-dev:
  Installed: 1.7-1
  Candidate: 1.7-1
  Version table:
 *** 1.7-1 0
        200 http://ftp.debian.org/debian/ experimental/main i386 Packages
        100 /var/lib/dpkg/status
     1.6-1 0
        500 http://ftp.debian.org/debian/ sid/main i386 Packages
        500 http://ftp2.de.debian.org/debian/ sid/main i386 Packages

libxcb-xfixes0-dev:
  Installed: 1.7-1
  Candidate: 1.7-1
  Version table:
 *** 1.7-1 0
        200 http://ftp.debian.org/debian/ experimental/main i386 Packages
        100 /var/lib/dpkg/status
     1.6-1 0
        500 http://ftp.debian.org/debian/ sid/main i386 Packages
        500 http://ftp2.de.debian.org/debian/ sid/main i386 Packages

libpoppler-glib-dev:
  Installed: 0.12.4-1.2
  Candidate: 0.12.4-1.2
  Version table:
 *** 0.12.4-1.2 0
        500 http://ftp.debian.org/debian/ sid/main i386 Packages
        500 http://ftp2.de.debian.org/debian/ sid/main i386 Packages
        100 /var/lib/dpkg/status

libx11-xcb-dev:
  Installed: 2:1.3.3-3
  Candidate: 2:1.3.3-3
  Version table:
 *** 2:1.3.3-3 0
        500 http://ftp.debian.org/debian/ sid/main i386 Packages
        500 http://ftp2.de.debian.org/debian/ sid/main i386 Packages
        100 /var/lib/dpkg/status


--SD // 31-Oct-2010