[gentoo-user] Weird warning message when emerging gcc

[Nikos Chantziaras]

A world update emerged gcc-5.4.0-r2 (update from 5.4.0). At the end of 
the build, I got this:

  * Python seems to be broken, attempting to locate CHOST ourselves ...
  * Switching native-compiler to x86_64-pc-linux-gnu-5.4.0 
...PORTAGE_BZIP2_COMMAND setting is invalid: 'bzip2'
PORTAGE_BZIP2_COMMAND setting from make.globals is invalid: 'bzip2'

I'm not seeing how python is broken here (works fine), and why 
PORTAGE_BZIP2_COMMAND is invalid. Can someone explain what's going on here?