Details of sys-libs/glibc:

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
Skipping extra tests because in systemd-nspawn container

 if (( ret == 0 )); then
  noun=
locale-gen(8) issued the following ${noun}s:
$REPLY
Failed to refresh the ld.so.cache for you. Some programs may be broken
before you manually do so (ldconfig -i).

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
Skipping extra tests because in systemd-nspawn container

 if (( ret == 0 )); then
  noun=
locale-gen(8) issued the following ${noun}s:
$REPLY
Failed to refresh the ld.so.cache for you. Some programs may be broken
before you manually do so (ldconfig -i).

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
Skipping extra tests because in systemd-nspawn container

 if (( ret == 0 )); then
  noun=
locale-gen(8) issued the following ${noun}s:
$REPLY
Failed to refresh the ld.so.cache for you. Some programs may be broken
before you manually do so (ldconfig -i).

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
Skipping extra tests because in systemd-nspawn container

 if (( ret == 0 )); then
  noun=
locale-gen(8) issued the following ${noun}s:
$REPLY
Failed to refresh the ld.so.cache for you. Some programs may be broken
before you manually do so (ldconfig -i).

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
Skipping extra tests because in systemd-nspawn container

 if (( ret == 0 )); then
  noun=
locale-gen(8) issued the following ${noun}s:
$REPLY
Failed to refresh the ld.so.cache for you. Some programs may be broken
before you manually do so (ldconfig -i).

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
Skipping extra tests because in systemd-nspawn container
Failed to refresh the ld.so.cache for you. Some programs may be broken
before you manually do so (ldconfig -i).
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
Skipping extra tests because in systemd-nspawn container
Failed to refresh the ld.so.cache for you. Some programs may be broken
before you manually do so (ldconfig -i).
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
Skipping extra tests because in systemd-nspawn container
Failed to refresh the ld.so.cache for you. Some programs may be broken
before you manually do so (ldconfig -i).
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
Skipping extra tests because in systemd-nspawn container
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
(See bug #660556, bug #741116, bug #823756, etc)
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
After upgrading glibc, please restart all running processes.
Be sure to include init (telinit u) or systemd (systemctl daemon-reexec).
Alternatively, reboot your system.
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.

Simple build failed ... assuming this is desired #324685
You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS.
This will result in a 50% performance penalty when running with a 32bit
hypervisor, which is probably not what you want.
Failed to compile the ABI test. Broken host glibc?
locale-gen(8) unexpectedly failed during the ${EBUILD_PHASE_FUNC} phase

Your ${EROOT}/etc/nsswitch.conf uses NIS. Support for that has been
removed from glibc and is now provided by the package
  sys-auth/libnss-nis
Install it now to keep your NIS setup working.