A newer version of pdf2djvu seems to be required to build against newer versions of libpoppler, see bug 699818. Reproducible: Always
pdf2djvu (0.9.15) unstable; urgency=low * Fix build failure with Poppler ≥ 0.83. https://github.com/jwilk/pdf2djvu/blob/master/doc/changelog
$ ACCEPT_KEYWORDS="~amd64" emerge -p1 pdf2djvu These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild N ] media-gfx/graphicsmagick-1.3.35 USE="bzip2 cxx openmp zlib -X -debug -fpx -imagemagick -jbig -jpeg -lcms -lzma -modules -perl -png -postscript -q16 -q32 -static-libs -svg -threads -tiff -truetype -webp -wmf" [ebuild N ] app-text/pdf2djvu-0.9.15 USE="graphicsmagick openmp -nls -test