backported libpulse-dev cannot be installed due to dependency version issues (caused by the backport)
libpulse-dev cannot be installed because it asks dependencies at a
specific version while the backported dependencies are at a later version.
Pasting the result of apt-get so you can see the error.
apt-get install libpulse-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
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:
libpulse-dev : Depends: libpulse0 (= 5.0-13) but 7.1-2~bpo8+1 is to be
Depends: libpulse-mainloop-glib0 (= 5.0-13) but
7.1-2~bpo8+1 is to be installed
E: Unable to correct problems, you have held broken packages.
You see? It asks for dependencies at a specific version, but the
backported dependency is at a later version, so it fails.