BuildStream will not work in Arch stock kernel; bublewarp is not supported without user namespaces enabled

$ git clone https://gnome7.codethink.co.uk/gnome-modulesets.git
$ cd gnome-modulesets
$ bst build --track core/adwaita-icon-theme.bst


    [00:00:00][a20bdad6][build:base/base-configure.bst       ] FAILURE Running 'commands'
    [00:00:19][a20bdad6][build:base/base-configure.bst       ] FAILURE gnome/base-base-configure/a20bdad6-build.5354.log
     
        Command '# Avoid some chowns which fail at dpkg configure time
        #
        mv /bin/chown /bin/chown.real
        ln -s true /bin/chown
        ' failed with exitcode 1
     
        Sandbox directory: /home/jjardon/.cache/buildstream/build/base-base-configure-vt8qmmqg
     
       
        [00:00:19] SUCCESS [base/base-system.bst]: Staging base/base-system.bst/2fe29140
        [00:00:19] SUCCESS [base/base-configure.bst]: Staging base/base-system.bst at /
        [--:--:--] START   [base/base-configure.bst]: Integrating base/base-system.bst
        [00:00:00] SUCCESS [base/base-configure.bst]: Integrating base/base-system.bst
        [--:--:--] START   [base/base-configure.bst]: Running 'commands'
        [--:--:--] STATUS  [base/base-configure.bst]: Running command
       
            # Avoid some chowns which fail at dpkg configure time
            #
            mv /bin/chown /bin/chown.real
            ln -s true /bin/chown
        bwrap: Creating new namespace failed, likely because the kernel does not support user namespaces.  bwrap must be installed setuid on such systems.
        [00:00:00] FAILURE [base/base-configure.bst]: Running 'commands'
        [00:00:19] FAILURE [base/base-configure.bst]: Build
       
            Command '# Avoid some chowns which fail at dpkg configure time
            #
            mv /bin/chown /bin/chown.real
            ln -s true /bin/chown
            ' failed with exitcode 1
     
     
    Build failure on element: base/base-configure.bst