Trying to install Thunar on gentoo gives me an error

!!! All ebuilds that could satisfy ">=dev-libs/libdbusmenu-16.04.0[gtk3]" have been masked.
!!! One of the following masked packages is required to complete your request:
- dev-libs/libdbusmenu-16.04.0-r1::gentoo (masked by: )


(masked by: )

what does this even imply????

i dont have it masked anywhere, neither have i have this masked somehwere in package.mask