Проблема при установке Mono.

При установке Mono получаю вот это:

 * 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: dev-lang/mono-4.4.1.0::gentoo failed (pretend phase):
 *   Kernel not configured; no .config found in /lib/modules/4.4.17-calculate/build
 * 
 * Call stack:
 *     ebuild.sh, line  115:  Called pkg_pretend
 *   environment, line 3451:  Called check_extra_config
 *   environment, line  690:  Called require_configured_kernel
 *   environment, line 3779:  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 '=dev-lang/mono-4.4.1.0::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-lang/mono-4.4.1.0::gentoo'`.
 * The complete build log is located at '/var/calculate/tmp/portage/dev-lang/mono-4.4.1.0/temp/build.log'.
 * The ebuild environment file is located at '/var/calculate/tmp/portage/dev-lang/mono-4.4.1.0/temp/environment'.
 * Working directory: '/usr/lib64/python3.4/site-packages'
 * S: '/var/calculate/tmp/portage/dev-lang/mono-4.4.1.0/work/mono-4.4.1.0'

 * Messages for package dev-lang/mono-4.4.1.0:

 * 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: dev-lang/mono-4.4.1.0::gentoo failed (pretend phase):
 *   Kernel not configured; no .config found in /lib/modules/4.4.17-calculate/build
 * 
 * Call stack:
 *     ebuild.sh, line  115:  Called pkg_pretend
 *   environment, line 3451:  Called check_extra_config
 *   environment, line  690:  Called require_configured_kernel
 *   environment, line 3779:  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 '=dev-lang/mono-4.4.1.0::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-lang/mono-4.4.1.0::gentoo'`.
 * The complete build log is located at '/var/calculate/tmp/portage/dev-lang/mono-4.4.1.0/temp/build.log'.
 * The ebuild environment file is located at '/var/calculate/tmp/portage/dev-lang/mono-4.4.1.0/temp/environment'.
 * Working directory: '/usr/lib64/python3.4/site-packages'
 * S: '/var/calculate/tmp/portage/dev-lang/mono-4.4.1.0/work/mono-4.4.1.0'

С gentoo и calculate знаком день, матчасти не знаю.
Установлено и работает ванильное ядро 4.8, но из вывода консоли можно предположить, что .config ищется в папке со старым ядром.
Помогите, пожалуйста, разобраться в проблеме и пофиксить.

Кривой ебилд. Бинарный пакет пока удалим из репозитория. Монтейнерам отпишем.

Поставить пока можно так:

FEATURES="-getbinpkg" emerge -O mono