ERROR: app-text/qpdf-5.1.1-r1::gentoo failed (compile phase):
* emake failed
*
* If you need support, post the output of `emerge --info '=app-text/qpdf-5.1.1-r1::gentoo'`,
* the complete build log and the output of `emerge -pqv '=app-text/qpdf-5.1.1-r1::gentoo'`.
* The complete build log is located at '/var/tmp/portage/app-text/qpdf-5.1.1-r1/temp/build.log'.
* The ebuild environment file is located at '/var/tmp/portage/app-text/qpdf-5.1.1-r1/temp/environment'.
* Working directory: '/var/tmp/portage/app-text/qpdf-5.1.1-r1/work/qpdf-5.1.1'
* S: '/var/tmp/portage/app-text/qpdf-5.1.1-r1/work/qpdf-5.1.1'

* Regenerating GNU info directory index...
* Processed 104 info files.

!!! existing preserved libs:
>>> package: sys-apps/systemd-233-r6
* - /usr/lib/libsystemd.so.0
* - /usr/lib/libsystemd.so.0.18.0
*      used by /lib/libprocps.so.6.0.0 (sys-process/procps-3.3.12)
*      used by /usr/bin/logger (sys-apps/util-linux-2.30.2)
*      used by /usr/bin/lslogins (sys-apps/util-linux-2.30.2)
*      used by /usr/sbin/uuidd (sys-apps/util-linux-2.30.2)
Use memerge @preserved-rebuild to rebuild packages using these libraries

* IMPORTANT: config file '/etc/locale.gen' needs updating.
* See the CONFIGURATION FILES and CONFIGURATION FILES UPDATE TOOLS
* sections of the emerge man page to learn how to update config files.
* After world updates, it is important to remove obsolete packages with
* emerge --depclean. Refer to `man emerge` for more information.