Version 3-1.0.4 is available upstream. Please consider updating!
It seems that version 3-1.0.4 is available upstream, while the latest version in the Gentoo tree is 2.7.0. You think this warning is false? Read more about it here.
fvwm is an ICCCM-compliant X window manager providing a 3D look for
window decorations, multiple discontiguous virtual desktops, a high
degree of configurability, and an external module interface for
implementing functional extensions.