* Package:    app-emulation/docker-proxy-0.8.0_p20181207
 * Repository: gentoo
 * Maintainer: tianon@dockerproject.org mrueg@gentoo.org,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-emulation/docker-proxy-0.8.0_p20181207/work
>>> Preparing source in /var/tmp/portage/app-emulation/docker-proxy-0.8.0_p20181207/work/docker-proxy-0.8.0_p20181207/src/github.com/docker/libnetwork ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/app-emulation/docker-proxy-0.8.0_p20181207/work/docker-proxy-0.8.0_p20181207/src/github.com/docker/libnetwork ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/app-emulation/docker-proxy-0.8.0_p20181207/work/docker-proxy-0.8.0_p20181207/src/github.com/docker/libnetwork ...
failed to initialize build cache at /root/cache/go-build: mkdir /root/cache: permission denied
 * ERROR: app-emulation/docker-proxy-0.8.0_p20181207::gentoo failed (compile phase):
 *   (no error message)
 * 
 * Call stack:
 *     ebuild.sh, line 124:  Called src_compile
 *   environment, line 423:  Called die
 * The specific snippet of code:
 *       GOPATH="${WORKDIR}/${P}" go build -o "bin/docker-proxy" ./cmd/proxy || die
 * 
 * If you need support, post the output of `emerge --info '=app-emulation/docker-proxy-0.8.0_p20181207::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=app-emulation/docker-proxy-0.8.0_p20181207::gentoo'`.
 * The complete build log is located at '/var/log/portage/app-emulation:docker-proxy-0.8.0_p20181207:20190227-194206.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/app-emulation/docker-proxy-0.8.0_p20181207/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-emulation/docker-proxy-0.8.0_p20181207/temp/environment'.
 * Working directory: '/var/tmp/portage/app-emulation/docker-proxy-0.8.0_p20181207/work/docker-proxy-0.8.0_p20181207/src/github.com/docker/libnetwork'
 * S: '/var/tmp/portage/app-emulation/docker-proxy-0.8.0_p20181207/work/docker-proxy-0.8.0_p20181207/src/github.com/docker/libnetwork'