Comment 5 for bug 320273

Package: apt-build
Version: 0.12.37
Severity: normal

Happens for bsdutils as well (binary package bsdutils uses epoch 1, source package util-linux doesn't use an epoch):

twin:/# apt-build install bsdutils
bsdutils will not be built because it doesn't have a source package.
Missing source package name for source_by_source().
twin:/# apt-cache policy bsdutils
bsdutils:
  Installed: 1:2.13.1.1-1
  Candidate: 1:2.13.1.1-1
  Version table:
 *** 1:2.13.1.1-1 0
        500 http://ftp.de.debian.org squeeze/main Packages
        100 /var/lib/dpkg/status
twin:/# apt-cache show bsdutils
Package: bsdutils
Essential: yes
Priority: required
Section: utils
Installed-Size: 164
Maintainer: LaMont Jones <email address hidden>
Architecture: i386
Source: util-linux (2.13.1.1-1)
Version: 1:2.13.1.1-1
Depends: libc6 (>= 2.7-1)
Recommends: bsdmainutils
Filename: pool/main/u/util-linux/bsdutils_2.13.1.1-1_i386.deb
Size: 61710
MD5sum: 51ee792a8ed9a72b78cb8bff86d0714a
SHA1: 4ccb48f12d0b57ff1744b5a288d44e7ac40ec855
SHA256: 04931f8005d6f95bf385e8ca90873d3ea88a38d247a0badbce63649727a37b89
Description: Basic utilities from 4.4BSD-Lite
 This package contains the bare minimum number of BSD utilities needed
 to boot a Debian system. You should probably also install
 bsdmainutils to get the remaining standard BSD utilities.
 .
 Included are: cal, col, colcrt, colrm, column, logger, renice,
 script, scriptreplay, ul, wall
Tag: admin::logging, implemented-in::c, interface::commandline, role::program, scope::utility, suite::bsd, works-with::software:running, works-with::text

twin:/# apt-cache showsrc util-linux
Package: util-linux
Binary: util-linux, util-linux-locales, mount, bsdutils, fdisk-udeb, cfdisk-udeb
Version: 2.13.1.1-1
Priority: required
Section: utils
Maintainer: LaMont Jones <email address hidden>
Build-Depends: debhelper (>= 5), dpkg-dev (>= 1.13.12), gettext, libblkid-dev, libncurses5-dev, libselinux1-dev [!kfreebsd-i386 !kfreebsd-amd64 !hurd-i386], libslang2-dev (>= 2.0.4), lsb-release, uuid-dev, zlib1g-dev
Architecture: any
Standards-Version: 3.7.3.0
Format: 1.0
Directory: pool/main/u/util-linux
Files:
 ffc72fe1bd629daee8d25ffedd796af8 947 util-linux_2.13.1.1-1.dsc
 adc94b2951d0e97cbbda8b2bbdc55c00 4022334 util-linux_2.13.1.1.orig.tar.gz
 05256573ef054f1dfd9013e1f15a49e8 70480 util-linux_2.13.1.1-1.diff.gz
Vcs-Browser: http://git.debian.org/?p=users/lamont/util-linux.git
Vcs-Git: git://git.debian.org/~lamont/util-linux.git

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (x86_64)

Kernel: Linux 2.6.26-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages apt-build depends on:
ii apt 0.7.21 Advanced front-end for dpkg
ii apt-utils 0.7.21 APT utility programs
ii debconf [debconf-2.0] 1.5.26 Debian configuration management sy
ii devscripts 2.10.48 scripts to make the life of a Debi
ii dpkg-dev 1.14.26 Debian package development tools
ii g++ 4:4.3.3-3 The GNU C++ compiler
ii gcc 4:4.3.3-3 The GNU C compiler
ii libappconfig-perl 1.56-2 Perl module for configuration file
ii libapt-pkg-perl 0.1.23 Perl interface to libapt-pkg
ii libc6 2.9-4 GNU C Library: Shared libraries
ii perl 5.10.0-19 Larry Wall's Practical Extraction

Versions of packages apt-build recommends:
ii build-essential 11.4 Informational list of build-essent
ii fakeroot 1.12.2 Gives a fake root environment

apt-build suggests no packages.

-- debconf information excluded