app-text/apvlv
Alf's PDF/DJVU/EPUB Viewer like Vim
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debug
Global: Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see http://www.gentoo.org/proj/en/qa/backtraces.xml
djvu
Global: support DjVu, a PDF-like document format esp. suited for scanned documents