saving uncommitted changes in /etc prior to emerge run

conf.d/prelink

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+# For an in depth prelinking guide, please see:
+# http://www.gentoo.org/doc/en/prelink-howto.xml
+
+# Control prelinking behavior in the cronjob.
+#  yes - automatically prelink the system
+#  no  - automatically un-prelink the system
+#  ""  - do nothing at all (user manages)
+# (if you change this from yes to no prelink -ua
+# will be run next night to undo prelinking)
+PRELINKING=""
+
+# Options to pass to prelink
+# -m	Try to conserve virtual memory by allowing overlapping
+#	assigned virtual memory slots for libraries which
+#	never appear together in one binary
+# -R	Randomize virtual memory slot assignments for libraries.
+#	This makes it slightly harder for various buffer overflow
+#	attacks, since library addresses will be different on each
+#	host using -R.
+PRELINK_OPTS=-mR
+
+# How often should full prelink be run (in days)
+# Normally, prelink will be run in quick mode, every
+# $PRELINK_FULL_TIME_INTERVAL days it will be run
+# in normal mode.  Comment it out if it should be run
+# in normal mode always.
+PRELINK_FULL_TIME_INTERVAL=14
+
+# How often should prelink run (in days) even if
+# no packages have been upgraded via portage.
+# If $PRELINK_FULL_TIME_INTERVAL days have not elapsed
+# yet since last normal mode prelinking, last
+# quick mode prelinking happened less than
+# $PRELINK_NOEMER_CHECK_INTERVAL days ago
+# and no packages have been upgraded by portage
+# since last quick mode prelinking, prelink
+# will not do anything.
+# Change to
+# PRELINK_NOEMER_CHECK_INTERVAL=0
+# if you want to disable the portage database timestamp
+# check (especially if you don't use portage
+# exclusively to upgrade system libraries and/or binaries).
+PRELINK_NOEMER_CHECK_INTERVAL=7