* Package:    app-metrics/process-exporter-0.4.0-r1
 * Repository: gentoo
 * Maintainer: williamh@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/process-exporter-0.4.0-r1/work
>>> Preparing source in /var/tmp/portage/app-metrics/process-exporter-0.4.0-r1/work/process-exporter-0.4.0 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/app-metrics/process-exporter-0.4.0-r1/work/process-exporter-0.4.0 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/app-metrics/process-exporter-0.4.0-r1/work/process-exporter-0.4.0 ...
/var/tmp/portage/app-metrics/process-exporter-0.4.0-r1/work/process-exporter-0.4.0/src/github.com/ncabatoff/process-exporter /var/tmp/portage/app-metrics/process-exporter-0.4.0-r1/work/process-exporter-0.4.0
make -j1 build 
>> building code
cd cmd/process-exporter; CGO_ENABLED=0 go build -o ../../process-exporter -a -tags netgo
failed to initialize build cache at /root/cache/go-build: mkdir /root/cache: permission denied
make: *** [Makefile:29: build] Error 1
 * ERROR: app-metrics/process-exporter-0.4.0-r1::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=app-metrics/process-exporter-0.4.0-r1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=app-metrics/process-exporter-0.4.0-r1::gentoo'`.
 * The complete build log is located at '/var/log/portage/app-metrics:process-exporter-0.4.0-r1:20190306-102441.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/app-metrics/process-exporter-0.4.0-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-metrics/process-exporter-0.4.0-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/app-metrics/process-exporter-0.4.0-r1/work/process-exporter-0.4.0/src/github.com/ncabatoff/process-exporter'
 * S: '/var/tmp/portage/app-metrics/process-exporter-0.4.0-r1/work/process-exporter-0.4.0'