Thanks for your attentions.
I think that all packages that depends on wxGTK need to rebuild.
In my case packages are :
$ equery d x11-libs/wxGTK
* These packages depend on x11-libs/wxGTK:
app-arch/p7zip-16.02-r4 (wxwidgets ? x11-libs/wxGTK:3.0[X])
dev-python/wxpython-3.0.2.0 (>=x11-libs/wxGTK-3.0.2.0:3.0[libnotify=,opengl?,tiff,X])
media-gfx/hugin-2018.0.0 (x11-libs/wxGTK:3.0[X,opengl])
media-sound/spek-0.8.3-r1 (x11-libs/wxGTK:3.0[X])
net-ftp/filezilla-3.39.0 (>=x11-libs/wxGTK-3.0.4:3.0-gtk3[X])
sci-misc/boinc-7.14.2 (X ? x11-libs/wxGTK:3.0-gtk3[X,opengl,webkit])
wxGTK versions are slotted :
x11-libs/wxGTK
Available versions:
(3.0) 3.0.3 3.0.4 (~)3.0.4-r1
(3.0-gtk3) 3.0.3-r300 3.0.4-r300 (~)3.0.4-r301