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Problem upgrading

Ghost masked package

emerge update blocked by some ghost masked package:

!!! All ebuilds that could satisfy "=dev-util/boost-build-1.63*" have been masked.
!!! One of the following masked packages is required to complete your request:
- dev-util/boost-build-1.63.0::gentoo (masked by: )

(dependency required by "dev-libs/boost-1.63.0::gentoo" [ebuild])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.

See solution and full discussion at:

External resources