Packages with the netpbm use flag

app-office / texmacs : Wysiwyg text processor with high-quality maths

  • Add support for media-libs/netpbm

dev-perl / PDL : Perl Data Language for scientific computing

x11-wm / fvwm : An extremely powerful ICCCM-compliant multiple virtual desktop window manager

  • Enable NetPBM support (used by FvwmScript-ScreenDump)