I checked in changes to dvipdfmx's src/Makefile.am so that the TL zlib and libpng should be found now, and remade the generated files. Vladimir, Staszek, all, hope it will fly now ... (I was confused before, it was dvipdfm, no x, which was finding the TL libs; dvipdfmx never was. Long strings of consonants don't make for good package names.)