message: Reset the default backend renderer to poppler.
  The MuPDF stuff is **not** ready for prime-time yet.
diff: @@ -36,14 +36,15 @@ FORMS += mainUI.ui \
  PropDialog.ui \
  BookmarkMenu.ui
  -isEmpty(USE_POPPLER){
  - message("Using MuPDF Backend")
  - LIBS += -lmupdf -lmupdfthird
  - SOURCES += Renderer-mupdf.cpp
  -}else{
  +isEmpty(USE_MUPDF) || !isEmpty(USE_POPPLER){
  message("Using Poppler-Qt5 Backend")
  LIBS += -lpoppler-qt5
  SOURCES += Renderer-poppler.cpp
  +}else{
  + message("Using MuPDF Backend")
  + LIBS += -lmupdf -lmupdfthird
  + SOURCES += Renderer-mupdf.cpp
  +
  }
  TRANSLATIONS = i18n/l-pdf_af.ts \
  