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akagi201@akgentoo /usr/src $ sudo emerge rtl8812au
Calculating dependencies... done!

>>> Verifying ebuild manifests

>>> Emerging (1 of 1) net-wireless/rtl8812au-4.2.5_p20140515::pentoo
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Could not find a Makefile in the kernel source directory.
 * Please ensure that /usr/src/linux points to a complete set of Linux sources
 * Unable to calculate Linux Kernel version for build, attempting to use running version
 * Could not find a usable .config in the kernel source directory.
 * Please ensure that /usr/src/linux points to a configured set of Linux sources.
 * If you are using KBUILD_OUTPUT, please set the environment var so that
 * it points to the necessary object directory so that it might find .config.
 * ERROR: net-wireless/rtl8812au-4.2.5_p20140515::pentoo failed (setup phase):
 *   Kernel not configured; no .config found in
 *
 * Call stack:
 *           ebuild.sh, line  93:  Called pkg_setup
 *           ebuild.sh, line 317:  Called linux-mod_pkg_setup
 *    linux-mod.eclass, line 570:  Called require_configured_kernel
 *   linux-info.eclass, line 294:  Called die
 * The specific snippet of code:
 *          die "Kernel not configured; no .config found in ${KV_OUT_DIR}"
 *
 * If you need support, post the output of `emerge --info '=net-wireless/rtl8812au-4.2.5_p20140515::pentoo'`,
 * the complete build log and the output of `emerge -pqv '=net-wireless/rtl8812au-4.2.5_p20140515::pentoo'`.
 * The complete build log is located at '/var/tmp/portage/net-wireless/rtl8812au-4.2.5_p20140515/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-wireless/rtl8812au-4.2.5_p20140515/temp/die.env'.
 * Working directory: '/usr/lib64/portage/pym'
 * S: '/var/tmp/portage/net-wireless/rtl8812au-4.2.5_p20140515/work/rtl8812au-4.2.5_p20140515'

>>> Failed to emerge net-wireless/rtl8812au-4.2.5_p20140515, Log file:

>>>  '/var/tmp/portage/net-wireless/rtl8812au-4.2.5_p20140515/temp/build.log'

 * Messages for package net-wireless/rtl8812au-4.2.5_p20140515:

 * Could not find a Makefile in the kernel source directory.
 * Please ensure that /usr/src/linux points to a complete set of Linux sources
 * Unable to calculate Linux Kernel version for build, attempting to use running version
 * Could not find a usable .config in the kernel source directory.
 * Please ensure that /usr/src/linux points to a configured set of Linux sources.
 * If you are using KBUILD_OUTPUT, please set the environment var so that
 * it points to the necessary object directory so that it might find .config.
 * ERROR: net-wireless/rtl8812au-4.2.5_p20140515::pentoo failed (setup phase):
 *   Kernel not configured; no .config found in
 *
 * Call stack:
 *           ebuild.sh, line  93:  Called pkg_setup
 *           ebuild.sh, line 317:  Called linux-mod_pkg_setup
 *    linux-mod.eclass, line 570:  Called require_configured_kernel
 *   linux-info.eclass, line 294:  Called die
 * The specific snippet of code:
 *          die "Kernel not configured; no .config found in ${KV_OUT_DIR}"
 *
 * If you need support, post the output of `emerge --info '=net-wireless/rtl8812au-4.2.5_p20140515::pentoo'`,
 * the complete build log and the output of `emerge -pqv '=net-wireless/rtl8812au-4.2.5_p20140515::pentoo'`.
 * The complete build log is located at '/var/tmp/portage/net-wireless/rtl8812au-4.2.5_p20140515/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-wireless/rtl8812au-4.2.5_p20140515/temp/die.env'.
 * Working directory: '/usr/lib64/portage/pym'
 * S: '/var/tmp/portage/net-wireless/rtl8812au-4.2.5_p20140515/work/rtl8812au-4.2.5_p20140515'