Собственно, уже выпилили поддержку GTK 1 и не только:
The old and unmaintained debian/and rpm/ directories have been remmoved; use the maintainers’ copies where available.
VMS support has been removed.
GTK1.x support has been removed.
GNOME-specific window hints (pre-EWMH) have been removed.
Some fvwm modules have been removed:
FvwmDragWell (no replacement)
FvwmGTK (no replacement)
FvwmSave (no replacement)
FvwmSaveDesk (no replacement)
FvwmScroll (no replacement)
FvwmTabs (no replacement, never worked anyway)
FvwmTaskBar (use FvwmButtons)
FvwmTheme (in core of fvwm as colorsets)
FvwmWharf (use FvwmButtons)
FvwmWinList (use WindowList command)
FvwmWindowMenu (use WindowList command)
FvwmIconBox (use the IconBox style instead)
