unstable/sid: libgtk-3-0 and libgtk-3-0-dbg

Hello,

I am an unstable/sid user on a vanilla x86-64 PC.

I am trying to debug some app code that uses libgtk+ 3.   I would be
very helpful to also have debug symbols for this library.

My libgtk-3-0 is currently 3.22.7-2.  Using aptitude, I tried to add
libgtk-3-0-dbg (3.4.2.7+deb7u1).  However, I get a conflict error
message requesting me to downgrade my libgtk-3-0... which is nearly
nuclear.  =]

Is it difficult to get libgtk-3-0-dbg up to 3.22.7-2?

If I can help, please let me know.

Thanks,
Arpe
Hongkong