Gentoo emerge How-to Install If "The following USE changes are necessary to proceed"

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This Tip Show How-to Proceed Installing Gentoo Packages by emerge when you Get
an Error Message “The following USE changes are necessary to proceed“.

Solution: Set the USE Flags on the /etc/portage/package.use/use File

Example:
If the Output for

emerge equo

Contains:

The following USE changes are necessary to proceed:
#required by app-admin/equo-144, required by equo (argument)
=sys-apps/file-5.12-r1 python
#required by sys-apps/entropy-144, required by app-admin/equo-144,
#required by equo (argument)
>=dev-db/sqlite-3.7.15.2 soundex

Then You Proceed to:

  1. nano /etc/portage/package.use/use
  2. Inserting: 
    #required by app-admin/equo-144, required by equo (argument)
=sys-apps/file-5.12-r1 python
#required by sys-apps/entropy-144, required by app-admin/equo-144, required by equo (argument)
>=dev-db/sqlite-3.7.15.2 soundex
  3. Ctrl+x to Save and Exit 🙂