Hi Hugh, > This isn't a bug with freetype or libpng1.6. The problem is that > you've mixed packages from two different distributions during a large > and very complex transition. > > Why are you installing packages from unstable (sid) on your testing > system? As you've seen, that is a guaranteed way to cause breakage.
You're right: my installation looks like a "Franken Debian" mixing packages from testing and unstable repositories. I'm using unstable because I needed to install VirtualBox and Firefox from unstable repositories (not available in testing). > You need to remove the libpng packages from your system and then > install the packages from testing. Then you will be able to install > libfreetype-dev. I solved my issue by removing unstable repository and packages installed from it. I replaced the installation for Firefox with official Mozilla repository and VirtualBox with "Fast Track" repo. You can close this bug. Thanks, Laurent