[gccsdk] Unable to autpbuild libpng12-0

Hi,

I'm just trying to autobuild libpng12-0, and it appears as though it's unable to find it in the downloaded sources:

jason@sourceror:~/gccsdk/trunk/build$ ../autobuilder/build -v libpng12-0
Autobuilder warning: polkit-policy-file-validate not found; continuing anyway
Autobuilder: using GCCSDK set values
Autobuilder: no local build-setvars found, using default build parameters
Autobuilder: Package "libpng12-0" will be built using rules at "/home/jason/gccsdk/trunk/autobuilder/libraries/graphics/libpng12-0"
Autobuilder: Dependency zlib1g satisfied by previous successful build
Autobuilder: Building package: libpng12-0
Autobuilder: Detected 4 CPUs: set AB_CPUS to use more or fewer (eg in case build breaks)
Autobuilder: Fetching source for libpng12-0
Autobuilder: Using existing Sources.gz (testing/main)
Autobuilder: Using existing Sources.gz (testing/contrib)
Autobuilder: Using existing Sources.gz (stable/main)
Autobuilder: Using existing Sources.gz (stable/contrib)
Autobuilder: Searching for libpng12-0 in ../Sources-testing-main.gz...
Autobuilder: Searching for libpng12-0 in ../Sources-testing-contrib.gz...
Autobuilder: Searching for libpng12-0 in ../Sources-stable-main.gz...
Autobuilder: Searching for libpng12-0 in ../Sources-stable-contrib.gz...
AutoBuilder: Package not found
Package libpng12-0: ***Failure***
Build for package "libpng12-0" failed

Looking at the four .gz files, the only references I can find are for libpng-dev.

Note that SVN for gccsdk itself appears up to date, and I've deleted the existing Sources-*.gz files to force an update.

Unfortunately, I'm not that familiar with the autobuild system, so I've no idea if libpng-dev can be easily swapped in. It's entirely possible I've done something weird :)