saving uncommitted changes in /etc prior to emerge run

pam.d/system-auth

@@ -0,0 +1,15 @@
+auth		required	pam_env.so 
+auth		required	pam_unix.so try_first_pass likeauth nullok 
+auth		optional	pam_permit.so
+ 
+account		required	pam_unix.so 
+account		optional	pam_permit.so
+ 
+password	required	pam_cracklib.so difok=2 minlen=8 dcredit=2 ocredit=2 retry=3 
+password	required	pam_unix.so try_first_pass use_authtok nullok sha512 shadow 
+password	optional	pam_permit.so
+ 
+session		required	pam_limits.so 
+session		required	pam_env.so 
+session		required	pam_unix.so 
+session		optional	pam_permit.so