The AUR repository on https://aur.archlinux.org/packages/plplot does not build PlPlot with fortran bindings. This is because the PKGBUILD file set ENABLE_fortran to ...
Fedora 27 provides at the moment plplot 5.12.x, which uses a new library scheme: there is no libplplotf95c.so anymore. Additionally the Fortran sees duplicated ...