emerge app-office/1C_Enterprise-server -pv

Local copy of remote index is up-to-date and will be used.

These are the packages that would be merged, in order:

Calculating dependencies... done!

emerge: there are no ebuilds built with USE flags to satisfy "dev-db/postgresql-server[1c]".
!!! One of the following packages is required to complete your request:
- dev-db/postgresql-server-9.3.5::gentoo (Missing IUSE: 1c)
- dev-db/postgresql-server-9.3.3::gentoo (Missing IUSE: 1c)
- dev-db/postgresql-server-9.2.9::gentoo (Missing IUSE: 1c)
- dev-db/postgresql-server-9.2.7::gentoo (Missing IUSE: 1c)
- dev-db/postgresql-server-9.1.14::gentoo (Missing IUSE: 1c)
- dev-db/postgresql-server-9.1.12::gentoo (Missing IUSE: 1c)
- dev-db/postgresql-server-9.0.18::gentoo (Missing IUSE: 1c)
- dev-db/postgresql-server-9.0.16::gentoo (Missing IUSE: 1c)
(dependency required by "app-office/1C_Enterprise-server-8.3.4.496::yuego[postgres]" [ebuild])
(dependency required by "app-office/1C_Enterprise-server" [argument])