Apvlv is a PDF Viewer based on GTK and poppler which uses Vi-like
keybindings. For example, to forward page,
to previous page, 'k','j','h', and 'l' to scroll a page up, down,
left or right. Typing '50' and will go forward 50 pages;
typing '30' and will go previous 30 pages. Apvlv can support
viewing a directory as contents of a pdf document. Press 'k' or 'j'
to move selected up or down, 'h' or 'l' to collapse or expand a dir,
and pressing 't' will open the selected document in a new tab.
This SlackBuild disables UMD file support.