New feature of bsd.port.mk: "Switching to root credentials". Do we need this ALWAYS?

[Sergey Matveychuk]

Lev Serebryakov wrote:
>   I don't think, that it was good idea to `su(1)' into `root' on ANY
> `make install'! It is very difficult to install port `locally' now,
> and it is very uncomfortable for me as maintainer of many ports. I

ports/55091 is quick fix for it. It implements INSTALL_AS_USER variable.

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