* Package:    app-emulation/cadvisor-0.33.0
 * Repository: gentoo
 * Maintainer: mrueg@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
 * Adding group 'cadvisor' to your system ...
 *  - Groupid: next available
 * Adding user 'cadvisor' to your system ...
 *  - Userid: 129
 *  - Shell: /sbin/nologin
 *  - Home: /dev/null
 *  - Groups: cadvisor
 *  - GECOS: added by portage for cadvisor
>>> Unpacking source...
>>> Source unpacked in /var/tmp/portage/app-emulation/cadvisor-0.33.0/work
>>> Preparing source in /var/tmp/portage/app-emulation/cadvisor-0.33.0/work/cadvisor-0.33.0 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/app-emulation/cadvisor-0.33.0/work/cadvisor-0.33.0 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/app-emulation/cadvisor-0.33.0/work/cadvisor-0.33.0 ...
/var/tmp/portage/app-emulation/cadvisor-0.33.0/work/cadvisor-0.33.0/src/github.com/google/cadvisor /var/tmp/portage/app-emulation/cadvisor-0.33.0/work/cadvisor-0.33.0
make -j1 build 
>> building assets
>> building binaries
>> building cadvisor
Building with -ldflags 
  -X github.com/google/cadvisor/version.Version=0.33.0
  -X github.com/google/cadvisor/version.Revision=511ec9e
  -X github.com/google/cadvisor/version.Branch=unknown
  -X github.com/google/cadvisor/version.BuildUser=@mr-fox
  -X github.com/google/cadvisor/version.BuildDate=20190228-14:22:32
  -X github.com/google/cadvisor/version.GoVersion=1.12
WORK=/var/tmp/portage/app-emulation/cadvisor-0.33.0/temp/go-build737799431
failed to initialize build cache at /root/cache/go-build: mkdir /root/cache: permission denied
make: *** [Makefile:43: build] Error 1
 * ERROR: app-emulation/cadvisor-0.33.0::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=app-emulation/cadvisor-0.33.0::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=app-emulation/cadvisor-0.33.0::gentoo'`.
 * The complete build log is located at '/var/log/portage/app-emulation:cadvisor-0.33.0:20190228-132228.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/app-emulation/cadvisor-0.33.0/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-emulation/cadvisor-0.33.0/temp/environment'.
 * Working directory: '/var/tmp/portage/app-emulation/cadvisor-0.33.0/work/cadvisor-0.33.0/src/github.com/google/cadvisor'
 * S: '/var/tmp/portage/app-emulation/cadvisor-0.33.0/work/cadvisor-0.33.0'