ember got in Build-Depends libboost-thread-dev (1.53) and libogre-dev which depends on boost 1.49. It causes Build-Depends conflict.
Checking for source dependency conflicts...
/usr/bin/sudo /usr/bin/apt-get --purge $CHROOT_OPTIONS -q -y install debhelper dh-autoreconf libalut-dev libatlas-cpp-0.6-dev libboost-thread-dev libcegui-mk2-dev liberis-1.3-dev liblua5.1-0-dev libmercator-0.3-dev libogre-dev libopenal-dev libpcre3-dev libsdl1.2-dev libsigc++-2.0-dev libtinyxml-dev libtolua++5.1-dev libvarconf-dev libwfut-0.2-dev pkg-config
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
libogre-dev : Depends: libboost-date-time1.49-dev but it is not going to be installed
Depends: libboost-thread1.49-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
apt-get failed.
Package installation failed
Trying to reinstall removed packages:
Trying to uninstall newly installed packages:
Source-dependencies not satisfied; skipping ember
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Finished at 20130827-2126
Build needed 00:00:00, 0k disk space
This should be resolved by Debian bug #704786, which is pending on the resolution of packaging problems in the ember stack.