gaia ~ # emerge -av media-video/cheese

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

Calculating dependencies... done!
[ebuild  N     ] media-video/cheese-3.34.0:0/8::gnome-kit  USE="introspection -test" 0 KiB

Total: 1 package (1 new), Size of downloads: 0 KiB

Would you like to merge these packages? [Yes/No] Y
>>> Verifying ebuild manifests
>>> Emerging (1 of 1) media-video/cheese-3.34.0::gnome-kit
>>> Failed to emerge media-video/cheese-3.34.0, Log file:
>>>  '/var/tmp/portage/media-video/cheese-3.34.0/temp/build.log'
>>> Jobs: 0 of 1 complete, 1 failed                 Load avg: 2.31, 2.39, 2.06
 * Package:    media-video/cheese-3.34.0
 * Repository: gnome-kit
 * Maintainer: gnome@gentoo.org
 * USE:        amd64 elibc_glibc introspection kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking cheese-3.34.0.tar.xz to /var/tmp/portage/media-video/cheese-3.34.0/work
>>> Source unpacked in /var/tmp/portage/media-video/cheese-3.34.0/work
>>> Preparing source in /var/tmp/portage/media-video/cheese-3.34.0/work/cheese-3.34.0 ...
 * Disabling deprecation warnings ...
 [ ok ]
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/media-video/cheese-3.34.0/work/cheese-3.34.0 ...
meson --buildtype plain --libdir lib64 --localstatedir /var/lib --prefix /usr --sysconfdir /etc --wrap-mode nodownload -Dintrospection=true -Dtests=false /var/tmp/portage/media-video/cheese-3.34.0/work/cheese-3.34.0 /var/tmp/portage/media-video/cheese-3.34.0/work/cheese-3.34.0-build
The Meson build system
Version: 0.59.1
Source dir: /var/tmp/portage/media-video/cheese-3.34.0/work/cheese-3.34.0
Build dir: /var/tmp/portage/media-video/cheese-3.34.0/work/cheese-3.34.0-build
Build type: native build
Project name: cheese
Project version: 3.34.0
C compiler for the host machine: x86_64-pc-linux-gnu-gcc (gcc 9.2.0 "x86_64-pc-linux-gnu-gcc (Funtoo 9.2.0) 9.2.0")
C linker for the host machine: x86_64-pc-linux-gnu-gcc ld.bfd 2.36.1
Vala compiler for the host machine: /usr/bin/valac-0.48 (valac 0.48.11)
Host machine cpu family: x86_64
Host machine cpu: x86_64
Found pkg-config: /usr/bin/x86_64-pc-linux-gnu-pkg-config (1.5.4)
Run-time dependency clutter-1.0 found: YES 1.26.4
Run-time dependency clutter-gst-3.0 found: YES 3.0.27
Run-time dependency clutter-gtk-1.0 found: YES 1.8.4
Run-time dependency gdk-pixbuf-2.0 found: YES 2.40.0
Run-time dependency gio-2.0 found: YES 2.70.0
Run-time dependency glib-2.0 found: YES 2.70.0
Run-time dependency gnome-desktop-3.0 found: YES 3.36.7
Run-time dependency gstreamer-1.0 found: YES 1.18.4
Run-time dependency gstreamer-pbutils-1.0 found: YES 1.18.4
Run-time dependency gstreamer-plugins-bad-1.0 found: YES 1.18.4
Run-time dependency gtk+-3.0 found: YES 3.24.23
Run-time dependency libcanberra found: YES 0.30
Library canberra-gtk3 found: YES
Library m found: YES
Library cheese-common found: YES
Library cheese-thumbview found: YES
Library config found: YES
Library eogthumbnav found: YES
Library posix found: YES
Run-time dependency x11 found: YES 1.6.9
Has header "X11/extensions/XTest.h" with dependency x11: YES 
Run-time dependency xtst found: YES 1.2.3
Checking for function "XTestFakeKeyEvent" with dependency xtst: YES 
Run-time dependency dbus-1 found: YES 1.12.20
Run-time dependency gnome-video-effects found: YES 0.5.0
Program gst-inspect-1.0 found: YES (/usr/bin/gst-inspect-1.0)
 * ACCESS DENIED:  open_wr:      /dev/video0
 * ACCESS DENIED:  open_wr:      /dev/video1
Run-time dependency gobject-introspection-1.0 found: YES 1.70.0
Found pkg-config: /usr/bin/x86_64-pc-linux-gnu-pkg-config (1.5.4)
Program glib-compile-resources found: YES (/usr/bin/glib-compile-resources)
Configuring org.gnome.Cheese.service using configuration
Dependency gobject-introspection-1.0 found: YES 1.70.0 (cached)
Dependency gobject-introspection-1.0 found: YES 1.70.0 (cached)
Program g-ir-scanner found: YES (/usr/bin/g-ir-scanner)
Dependency gobject-introspection-1.0 found: YES 1.70.0 (cached)
Program g-ir-compiler found: YES (/usr/bin/g-ir-compiler)
Program glib-mkenums found: YES (/usr/bin/glib-mkenums)
Program glib-mkenums found: YES (/usr/bin/glib-mkenums)
Compiler for C supports link arguments Wl,-version-script,/var/tmp/portage/media-video/cheese-3.34.0/work/cheese-3.34.0/libcheese/cheese-gtk.map: YES 
Configuring version.xml using configuration
Program gtkdoc-scan found: YES (/usr/bin/gtkdoc-scan)
Program gtkdoc-scangobj found: YES (/usr/bin/gtkdoc-scangobj)
Program gtkdoc-mkdb found: YES (/usr/bin/gtkdoc-mkdb)
Program gtkdoc-mkhtml found: YES (/usr/bin/gtkdoc-mkhtml)
Program gtkdoc-fixxref found: YES (/usr/bin/gtkdoc-fixxref)
Program xsltproc found: YES (/usr/bin/xsltproc)
Configuring config.h using configuration
Program meson_post_install.py found: YES (/usr/bin/python3.7 /var/tmp/portage/media-video/cheese-3.34.0/work/cheese-3.34.0/meson_post_install.py)
Build targets in project: 19

Option buildtype is: plain [default: debugoptimized]
Found ninja-1.9.0.git.kitware.dyndep-1.jobserver-1 at /usr/bin/ninja
>>> Source configured.
 * --------------------------- ACCESS VIOLATION SUMMARY ---------------------------
 * LOG FILE: "/var/tmp/portage/media-video/cheese-3.34.0/temp/sandbox.log"
 * 
VERSION 1.0
FORMAT: F - Function called
FORMAT: S - Access Status
FORMAT: P - Path as passed to function
FORMAT: A - Absolute Path (not canonical)
FORMAT: R - Canonical Path
FORMAT: C - Command Line

F: open_wr
S: deny
P: /dev/video0
A: /dev/video0
R: /dev/video0
C: /usr/libexec/gstreamer-1.0/gst-plugin-scanner -l /usr/bin/gst-inspect-1.0 

F: open_wr
S: deny
P: /dev/video1
A: /dev/video1
R: /dev/video1
C: /usr/libexec/gstreamer-1.0/gst-plugin-scanner -l /usr/bin/gst-inspect-1.0 
 * --------------------------------------------------------------------------------