* Package:    app-admin/serf-0.8.1-r1
 * Repository: gentoo
 * Maintainer: zmedico@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
 * Adding group 'serf' to your system ...
 *  - Groupid: next available
 * Adding user 'serf' to your system ...
 *  - Userid: 160
 *  - Shell: /sbin/nologin
 *  - Home: /var/lib/serf
 *  - Groups: serf
 *  - GECOS: added by portage for serf
 *  - Creating /var/lib/serf in /
>>> Unpacking source...
 * Vendoring github.com/mitchellh/gox github.com-mitchellh-gox-c9740af9c6574448fd48eb30a71f964014c7a837.tar.gz
 * Vendoring github.com/mitchellh/iochan github.com-mitchellh-iochan-87b45ffd0e9581375c491fef3d32130bb15c5bd7.tar.gz
>>> Source unpacked in /var/tmp/portage/app-admin/serf-0.8.1-r1/work
>>> Preparing source in /var/tmp/portage/app-admin/serf-0.8.1-r1/work/serf-0.8.1 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/app-admin/serf-0.8.1-r1/work/serf-0.8.1 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/app-admin/serf-0.8.1-r1/work/serf-0.8.1 ...
WORK=/var/tmp/portage/app-admin/serf-0.8.1-r1/temp/go-build109204202
failed to initialize build cache at /root/cache/go-build: mkdir /root/cache: permission denied
 * ERROR: app-admin/serf-0.8.1-r1::gentoo failed (compile phase):
 *   (no error message)
 * 
 * Call stack:
 *     ebuild.sh, line 124:  Called src_compile
 *   environment, line 1466:  Called die
 * The specific snippet of code:
 *       go install -v -work -x ${EGO_BUILD_FLAGS} "github.com/mitchellh/gox/..." || die;
 * 
 * If you need support, post the output of `emerge --info '=app-admin/serf-0.8.1-r1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=app-admin/serf-0.8.1-r1::gentoo'`.
 * The complete build log is located at '/var/log/portage/app-admin:serf-0.8.1-r1:20190301-034957.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/app-admin/serf-0.8.1-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-admin/serf-0.8.1-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/app-admin/serf-0.8.1-r1/work/serf-0.8.1'
 * S: '/var/tmp/portage/app-admin/serf-0.8.1-r1/work/serf-0.8.1'