* Package:    app-metrics/vault_exporter-0.1.2
 * 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
>>> Unpacking source...
>>> Source unpacked in /var/tmp/portage/app-metrics/vault_exporter-0.1.2/work
>>> Preparing source in /var/tmp/portage/app-metrics/vault_exporter-0.1.2/work/vault_exporter-0.1.2 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/app-metrics/vault_exporter-0.1.2/work/vault_exporter-0.1.2 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/app-metrics/vault_exporter-0.1.2/work/vault_exporter-0.1.2 ...
/var/tmp/portage/app-metrics/vault_exporter-0.1.2/work/vault_exporter-0.1.2/src/github.com/grapeshot/vault_exporter /var/tmp/portage/app-metrics/vault_exporter-0.1.2/work/vault_exporter-0.1.2
make -j1 build 
env GOOS=linux GOARCH=amd64 go build -o _output/bin/vault_exporter-v0.1.2.linux-amd64
failed to initialize build cache at /root/cache/go-build: mkdir /root/cache: permission denied
make: *** [Makefile:31: build] Error 1
 * ERROR: app-metrics/vault_exporter-0.1.2::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=app-metrics/vault_exporter-0.1.2::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=app-metrics/vault_exporter-0.1.2::gentoo'`.
 * The complete build log is located at '/var/log/portage/app-metrics:vault_exporter-0.1.2:20190227-192334.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/app-metrics/vault_exporter-0.1.2/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-metrics/vault_exporter-0.1.2/temp/environment'.
 * Working directory: '/var/tmp/portage/app-metrics/vault_exporter-0.1.2/work/vault_exporter-0.1.2/src/github.com/grapeshot/vault_exporter'
 * S: '/var/tmp/portage/app-metrics/vault_exporter-0.1.2/work/vault_exporter-0.1.2'