It looks like the poppler package provided in wheezy-backports is patched to not build the qt5 bindings. You can try one of these approaches:
1) ask the maintainers of the backport poppler package to add poppler-qt5 and poppler-qt5-dev
2) get the source package for poppler from jessie and try to compile that
3) or just try to install poppler from jessie (not encouraged by Debian, but often works)
My answers are not necessarily official YACReader statements but mostly represent my own opinion in technical matters.
get the sources from wheezy-backports and applies the patch below
That will do the job. It works for me, I needed libpoppler-qt5-1 and libpoppler-qt5-1-dev to compile the latest Nixnote from git
YACReader
