Bug#624365: apt-build: Fails to find source package

[Torquil Macdonald Sørensen <torquil@gmail.com>]

Package: apt-build
Version: 0.12.38
Severity: normal

While "apt-get source iceweasel" works fine, apt-build fails to find the
source package for iceweasel:

$ apt-build install iceweasel
iceweasel will not be built because it doesn't have a source package.
Missing source package name for source_by_source().

Best regards
Torquil Sørensen

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (400, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.38.4 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages apt-build depends on:
ii  apt                           0.8.14.1   Advanced front-end for dpkg
ii  apt-utils                     0.8.14.1   APT utility programs
ii  debconf [debconf-2.0]         1.5.38     Debian configuration management sy
ii  devscripts                    2.10.72    scripts to make the life of a Debi
ii  dpkg-dev                      1.16.0.2   Debian package development tools
ii  g++                           4:4.5.2-5  The GNU C++ compiler
ii  gcc                           4:4.5.2-5  The GNU C compiler
ii  libappconfig-perl             1.56-2     Perl module for configuration file
ii  libapt-pkg-perl               0.1.24+b1  Perl interface to libapt-pkg
ii  libc6                         2.11.2-13  Embedded GNU C Library: Shared lib
ii  perl                          5.10.1-20  Larry Wall's Practical Extraction 

Versions of packages apt-build recommends:
ii  build-essential               11.5       Informational list of build-essent
ii  fakeroot                      1.15.1-1   tool for simulating superuser priv

apt-build suggests no packages.

-- Configuration Files:
/etc/apt/sources.list.d/apt-build.list [Errno 13] Permission denied: u'/etc/apt/sources.list.d/apt-build.list'

-- debconf-show failed