Fix Gentoo Prefix with PRoot

Our institute administrator sliently relocated directories where I installed Gentoo Prefix. I can bootstrap again, but I want to explore something new. PRoot has been in my radar for years, and it was the main force behind GNURoot and termux for Android.

• static build https://github.com/proot-me/proot-static-build proot -b /disk01/xmass/gentoo:/disk/xmass/gentoo

  very slow

• change prefix in startprefix
• override environment variable export EPREFIX=/disk01/xmass/gentoo

• sync portage change location of gentoo in repos.conf to speed up rsync

  location = /disk01/xmass/gentoo/usr/portage
  

  emerge –sync

• emerge -1 portage baselayout

  env-update source profile

gcc gcc-config dynamic loader is imprinted by gcc

• portage bug: https://bugs.gentoo.org/607868

• m4 does not work stack overflow
• emerge -1evDt @system