emerge -avuDN @world
Local copy of remote index is up-to-date and will be used.
Local copy of remote index is up-to-date and will be used.
These are the packages that would be merged, in order:
Calculating dependencies - * ERROR: dev-qt/qtcore-4.8.7-r4::gentoo failed (depend phase):
 *   qt4-build-multilib.eclass could not be found by inherit()
 * 
 * Call stack:
 *                ebuild.sh, line 609:  Called source '/usr/portage/dev-qt/qtcore/qtcore-4.8.7-r4.ebuild'
 *   qtcore-4.8.7-r4.ebuild, line   5:  Called inherit 'qt4-build-multilib'
 *                ebuild.sh, line 290:  Called die
 / * The specific snippet of code:
 *   		[[ -z ${location} ]] && die "${1}.eclass could not be found by inherit()"
 * 
 * If you need support, post the output of `emerge --info '=dev-qt/qtcore-4.8.7-r4::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-qt/qtcore-4.8.7-r4::gentoo'`.
 * Working directory: '/usr/lib/python3.8/site-packages'
 * S: '/var/calculate/tmp/portage/dev-qt/qtcore-4.8.7-r4/work/qtcore-4.8.7'
... done!
[binary     U  ] dev-libs/libunistring-0.9.10-r1:0/2::gentoo [0.9.10:0/2::gentoo] USE="-doc -static-libs" ABI_X86="32 (64) (-x32)" 652 KiB
[binary  r  U  ] dev-db/lmdb-0.9.28:0/0.9.28::gentoo [0.9.23:0/0.9.23::gentoo] USE="-static-libs" ABI_X86="(64) -32 (-x32)" 121 KiB
[binary     U  ] dev-libs/elfutils-0.183::gentoo [0.182::gentoo] USE="bzip2 nls static-libs utils zstd -lzma -test (-threads) -valgrind" ABI_X86="32 (64) (-x32)" 1384 KiB
[binary     U  ] net-vpn/wireguard-tools-1.0.20210315::gentoo [1.0.20210223::gentoo] USE="wg-quick" 133 KiB
[binary     U  ] dev-python/urllib3-1.26.3-r1::gentoo [1.26.2-r3::gentoo] USE="-brotli -test" PYTHON_TARGETS="python3_8 (-pypy3) -python3_7 -python3_9" 215 KiB
[binary  rR    ] net-nds/openldap-2.4.57::gentoo  USE="berkdb crypt ipv6 samba sasl ssl syslog tcpd -cxx -debug -experimental -gnutls -iodbc -kerberos -kinit (-libressl) -minimal -odbc -overlays -pbkdf2 -perl (-selinux) -sha2 -smbkrb5passwd -static-libs -test" ABI_X86="32 (64) (-x32)" 2376 KiB
[binary  r  U  ] dev-python/cffi-1.14.5:0/1.14.5::gentoo [1.14.4:0/1.14.4::gentoo] USE="-doc -test" PYTHON_TARGETS="python3_8 -python3_7 -python3_9" 256 KiB
[binary  rR    ] dev-python/bcrypt-3.2.0::gentoo  USE="-test" PYTHON_TARGETS="python3_8 (-pypy3) -python3_7 -python3_9" 60 KiB
[binary  rR    ] dev-python/cryptography-3.3.2::gentoo  USE="-idna (-libressl) -test" PYTHON_TARGETS="python3_8 (-pypy3) -python3_7 -python3_9" 450 KiB
[binary     U  ] sys-apps/calculate-utils-3.6.9.1:3::calculate [3.6.8.23:3::calculate] USE="backup client console dbus desktop gpg install qt5 -minimal -pxe (-server)" PYTHON_TARGETS="python2_7" 2864 KiB

Total: 10 packages (7 upgrades, 3 reinstalls, 10 binaries), Size of downloads: 8506 KiB

The following packages are causing rebuilds:

  (dev-python/cffi-1.14.5:0/1.14.5::gentoo, binary scheduled for merge) causes rebuilds for:
    (dev-python/cryptography-3.3.2:0/0::gentoo, binary scheduled for merge)
    (dev-python/bcrypt-3.2.0:0/0::gentoo, binary scheduled for merge)
  (dev-db/lmdb-0.9.28:0/0.9.28::gentoo, binary scheduled for merge) causes rebuilds for:
    (net-nds/openldap-2.4.57:0/0::gentoo, binary scheduled for merge)