Check mk error in compilation from source git

root@383762055c13:/home/git/checkmk# tail -n 100 /home/git/checkmk/agents/windows/chroot/WinAgent/15/debootstrap/debootstrap.log
gpgv: Signature made Fri 27 Apr 2018 05:08:40 AM IST
gpgv:                using RSA key 3B4FE6ACC0B21F32
gpgv: Good signature from "Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com>"
mount: /proc: permission denied.
root@383762055c13:/home/git/checkmk# 

i have been able to clear all the errors for make dist, other than the mount… any update on this would help.