81:15.03 collect2: error: ld returned 1 exit status
81:15.03 gmake[4]: *** [/var/tmp/portage/www-client/firefox-69.0/work/firefox-69.0/config/rules.mk:660: libxul.so] Error 1
81:15.03 gmake[4]: Leaving directory '/var/tmp/portage/www-client/firefox-69.0/work/firefox-69.0/ff/toolkit/library'
81:15.03 gmake[3]: *** [/var/tmp/portage/www-client/firefox-69.0/work/firefox-69.0/config/recurse.mk:74: toolkit/library/target] Error 2
81:15.03 gmake[2]: *** [/var/tmp/portage/www-client/firefox-69.0/work/firefox-69.0/config/recurse.mk:34: compile] Error 2
81:15.03 gmake[1]: *** [/var/tmp/portage/www-client/firefox-69.0/work/firefox-69.0/config/rules.mk:391: default] Error 2
81:15.03 gmake: *** [client.mk:125: build] Error 2
81:15.05 11 compiler warnings present.
 * ERROR: www-client/firefox-69.0::gentoo failed (compile phase):
 *   (no error message)
 *
 * Call stack:
 *     ebuild.sh, line 125:  Called src_compile
 *   environment, line 5253:  Called die
 * The specific snippet of code:
 *       MOZ_MAKE_FLAGS="${MAKEOPTS} -O" SHELL="${SHELL:-${EPREFIX}/bin/bash}" MOZ_NOSPAM=1 ${_virtx} ./mach build --verbose || die
 *
 * If you need support, post the output of `emerge --info '=www-client/firefox-69.0::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=www-client/firefox-69.0::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/www-client/firefox-69.0/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/www-client/firefox-69.0/temp/environment'.
 * Working directory: '/var/tmp/portage/www-client/firefox-69.0/work/firefox-69.0'
 * S: '/var/tmp/portage/www-client/firefox-69.0/work/firefox-69.0'

 * Messages for package www-client/firefox-69.0:

 * sys-devel/clang:8 is missing! Cannot use LLVM slot 8 ...
 * ERROR: www-client/firefox-69.0::gentoo failed (compile phase):
 *   (no error message)
 *
 * Call stack:
 *     ebuild.sh, line 125:  Called src_compile
 *   environment, line 5253:  Called die
 * The specific snippet of code:
 *       MOZ_MAKE_FLAGS="${MAKEOPTS} -O" SHELL="${SHELL:-${EPREFIX}/bin/bash}" MOZ_NOSPAM=1 ${_virtx} ./mach build --verbose || die
 *
 * If you need support, post the output of `emerge --info '=www-client/firefox-69.0::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=www-client/firefox-69.0::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/www-client/firefox-69.0/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/www-client/firefox-69.0/temp/environment'.
 * Working directory: '/var/tmp/portage/www-client/firefox-69.0/work/firefox-69.0'
 * S: '/var/tmp/portage/www-client/firefox-69.0/work/firefox-69.0'
sudo emerge --ask --quiet --verbose --update --deep @world  7465.14s user 745.55s system 151% cpu 1:30:05.67 total