Maintainers for libplplot-dev are Debian Science Team <debian-science-maintainers@lists.alioth.debian.org>.
You may want to refer to the following packages that are part of the same source: libcsirocsa0, libcsironn0, libplplot-data, libplplot-java, libplplot-lua, libplplot-ocaml, libplplot-ocaml-dev, libplplot16, libplplot17, libplplotada-dev, libplplotada1-dev, libplplotada3-dev, libplplotada4, libplplotada4.1, libplplotada4.2, libplplotada5-dev, libplplotcxx14, libplplotcxx15, libplplotfortran0, libplplotqt2, libplplotwxwidgets1, libqsastime-dev, libqsastime0, octave-plplot, plplot-doc, plplot-driver-cairo, plplot-driver-qt, plplot-driver-wxwidgets, plplot-driver-xwin, plplot-examples, plplot-tcl, plplot-tcl-bin, plplot-tcl-dev, python3-plplot, python3-plplot-qt.
You might like to refer to the libplplot-dev package page, to the Package Tracking System, or to the source package src:plplot's bug page.
If you find a bug not listed here, please report it.