Check mk error in compilation from source git

I get the below error

W: Failure trying to run: chroot /home/git/checkmk-master/agents/windows/chroot/WinAgent/15 mount -t proc proc /proc

W: See /home/git/checkmk-master/agents/windows/chroot/WinAgent/15/debootstrap/debootstrap.log for details

Makefile:74: recipe for target ‘windows/check_mk_agent.msi’ failed

make[1]: *** [windows/check_mk_agent.msi] Error 1

make[1]: Leaving directory ‘/home/git/checkmk-master/agents’

Makefile:184: recipe for target ‘check_mk-1.7.0i1.tar.gz’ failed

make: *** [check_mk-1.7.0i1.tar.gz] Error 2

Try ‘tail --help’ for more information.

root@383762055c13:/home/git/checkmk-master# tail -f /home/git/checkmk-master/agents/windows/chroot/WinAgent/15/debootstrap/debootstrap.log

are supported and installed on your system.

perl: warning: Falling back to the standard locale (“C”).

perl: warning: Setting locale failed.

perl: warning: Please check that your locale settings:

LANGUAGE = “en_US.UTF-8”,

LC_ALL = “en_US.UTF-8”,

LANG = “C”

are supported and installed on your system.

perl: warning: Falling back to the standard locale (“C”).

mount: /proc: permission denied.