The program name pdfinfo is already used by xpdf and poppler, so packaging systems cannot install both poppler and mupdf as they are marked as conflicting packages. Please rename pdfinfo (maybe to mupdfinfo) to avoid the conflict. As an example, the C++ library podofo (http://podofo.sourceforge.net/) avoids this by naming its info program as podofopdfinfo. Reference: https://trac.macports.org/ticket/31780
Done.