pithos build: permission denied

pithos 1.4.0-1  (2017-09-11 23:36)
( Unsupported package: Potentially dangerous ! )
==> Edit PKGBUILD ? [Y/n] ("A" to abort)
==> ------------------------------------


==> pithos dependencies:
 - gtk3 (already installed)
 - python-gobject (already installed)
 - libsecret (already installed)
 - python-cairo (already installed)
 - gst-plugins-good (already installed)
 - gst-libav (already installed)
 - gst-plugins-base (already installed)
 - meson (already installed) [makedepend]
 - appstream-glib (already installed) [makedepend]


==> Continue building pithos ? [Y/n]
==> --------------------------------
==>

==> Building and installing package
==> Making package: pithos 1.4.0-1 (Di 12. Sep 21:43:19 CEST 2017)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Downloading pithos-1.4.0.tar.xz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   608    0   608    0     0    608      0 --:--:-- --:--:-- --:--:--   660
100   98k  100   98k    0     0  50196      0  0:00:02  0:00:02 --:--:--  120k
  -> Downloading pithos-1.4.0.tar.xz.asc...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   612    0   612    0     0    612      0 --:--:-- --:--:-- --:--:--   775
100   833  100   833    0     0    833      0  0:00:01  0:00:01 --:--:--  2119
  -> Found dbus.service
  -> Found systemd.service
==> Validating source files with sha256sums...
    pithos-1.4.0.tar.xz ... Passed
    pithos-1.4.0.tar.xz.asc ... Skipped
    dbus.service ... Passed
    systemd.service ... Passed
==> Verifying source file signatures with gpg...
    pithos-1.4.0.tar.xz ... Passed
==> Extracting sources...
  -> Extracting pithos-1.4.0.tar.xz with bsdtar
==> Starting build()...
The Meson build system
Version: 0.42.0
Source dir: /tmp/yaourt-tmp-nobody/aur-pithos/src/pithos-1.4.0
Build dir: /tmp/yaourt-tmp-nobody/aur-pithos/src/build
Build type: native build
Project name: pithos
Build machine cpu family: x86_64
Build machine cpu: x86_64
Found pkg-config: /usr/bin/pkg-config (0.29.2)
Native dependency glib-2.0 found: YES 2.52.3
Program glib-compile-schemas found: YES (/usr/bin/glib-compile-schemas)
Program appstream-util found: YES (/usr/bin/appstream-util)
Program desktop-file-validate found: YES (/usr/bin/desktop-file-validate)
Program glib-compile-schemas found: YES (/usr/bin/glib-compile-schemas)
Program gtk-builder-tool found: YES (/usr/bin/gtk-builder-tool)
Configuring pithos using configuration
Program sphinx-build-3 found: NO
Program sphinx-build found: NO
Program help2man found: NO
Program meson_post_install.py found: YES (/usr/bin/env python3 /tmp/yaourt-tmp-nobody/aur-pithos/src/pithos-1.4.0/meson_post_install.py)
Build targets in project: 8
==> Entering fakeroot environment...
==> Starting package()...
[3/4] Installing files.
Installing subdir /tmp/yaourt-tmp-nobody/aur-pithos/src/pithos-1.4.0/pithos to /usr/share/pithos
Installing data/pithos.gresource to /tmp/yaourt-tmp-nobody/aur-pithos/pkg/pithos/usr/share/pithos/pithos.gresource
Traceback (most recent call last):
  File "/usr/bin/meson", line 37, in <module>
    sys.exit(main())
  File "/usr/bin/meson", line 34, in main
    return mesonmain.run(sys.argv[1:], launcher)
  File "/usr/lib/python3.6/site-packages/mesonbuild/mesonmain.py", line 297, in run
    sys.exit(run_script_command(args[1:]))
  File "/usr/lib/python3.6/site-packages/mesonbuild/mesonmain.py", line 264, in run_script_command
    return cmdfunc(cmdargs)
  File "/usr/lib/python3.6/site-packages/mesonbuild/scripts/meson_install.py", line 370, in run
    do_install(datafilename)
  File "/usr/lib/python3.6/site-packages/mesonbuild/scripts/meson_install.py", line 190, in do_install
    install_targets(d)
  File "/usr/lib/python3.6/site-packages/mesonbuild/scripts/meson_install.py", line 311, in install_targets
    do_copyfile(fname, outname)
  File "/usr/lib/python3.6/site-packages/mesonbuild/scripts/meson_install.py", line 128, in do_copyfile
    restore_selinux_context(to_file)
  File "/usr/lib/python3.6/site-packages/mesonbuild/scripts/meson_install.py", line 96, in restore_selinux_context
    subprocess.check_call(['selinuxenabled'])
  File "/usr/lib/python3.6/subprocess.py", line 286, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib/python3.6/subprocess.py", line 267, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3.6/subprocess.py", line 707, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1333, in _execute_child
    raise child_exception_type(errno_num, err_msg)
PermissionError: [Errno 13] Permission denied
FAILED: meson-install
/usr/bin/python /usr/bin/meson --internal install /tmp/yaourt-tmp-nobody/aur-pithos/src/build/meson-private/install.dat
ninja: build stopped: subcommand failed.
==> ERROR: A failure occurred in package().
    Aborting...
==> ERROR: Makepkg was unable to build pithos.
==> Restart building pithos ? [y/N]
==> -------------------------------
==>