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

Calculating dependencies... done!
Dependency resolution took 1.13 s.

!!! All ebuilds that could satisfy "v2rayA" have been masked.
!!! One of the following masked packages is required to complete your request:
- net-proxy/v2rayA-9999::gentoo-zh (masked by: missing keyword)
- net-proxy/v2rayA-2.0.4::gentoo-zh (masked by: ~amd64 keyword)

For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.

wget https://objects.githubusercontent.com/g … tet-stream

or go to https://github.com/v2rayA/v2rayA/releases   get    one    debain*amd.deb
dpkg to install it     

启动 v2rayA

sudo systemctl start v2raya.service
设置开机自动启动

sudo systemctl enable v2raya.service
 
通过 2017 端口 如        http://localhost:2017      访问 UI 界面。

or to use
net-proxy/v2ray
dev-libs/v2ray-geoip-bin
dev-libs/v2ray-domain-list-community-bin

其他問題参考论坛相关帖子

proxy.golang.org 无法访问的问题：

go get 报错:dial tcp 172.217.160.113:443: i/o timeout解决方案

go env -w GO111MODULE=on
go env -w GOPROXY=https://goproxy.cn,direct