root@host /usr/src/linux # emerge --ask sys-kernel/installkernel-gentoo
PORTAGE_BZIP2_COMMAND setting is invalid: 'bzip2'
PORTAGE_BZIP2_COMMAND setting from make.globals is invalid: 'bzip2'

 * IMPORTANT: 8 news items need reading for repository 'gentoo'.
 * Use eselect news read to view new items.


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

Calculating dependencies... done!
[ebuild   R    ] sys-kernel/installkernel-gentoo-5

Would you like to merge these packages? [Yes/No] y

>>> Verifying ebuild manifests

>>> Emerging (1 of 1) sys-kernel/installkernel-gentoo-5::gentoo
[Errno 2] No such file or directory: 'mount':
   /bin/bash -c /usr/lib/portage/python3.10/ebuild.sh clean
Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/portage/process.py", line 419, in spawn
    _exec(
  File "/usr/lib/python3.10/site-packages/portage/process.py", line 797, in _exec
    s = subprocess.Popen(["mount", "--make-slave", "/proc"])
  File "/usr/lib/python3.10/subprocess.py", line 969, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.10/subprocess.py", line 1845, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'mount'
 * The ebuild phase 'die_hooks' has been aborted since PORTAGE_BUILDDIR
 * does not exist: '/var/tmp/portage/sys-kernel/installkernel-gentoo-5'

>>> Failed to emerge sys-kernel/installkernel-gentoo-5

 * Messages for package sys-kernel/installkernel-gentoo-5: