--- /usr/portage/sys-apps/shadow/files/pam.d-include/chpasswd	1970-01-01 01:00:00.000000000 +0100
+++ /usr/portage/sys-apps/shadow/files/pam.d-include/chpasswd	2020-03-13 21:00:04.167404864 +0100
@@ -0,0 +1,3 @@ 
+#%PAM-1.0
+
+password   include	system-auth
--- /usr/portage/sys-apps/shadow/shadow-4.8.1-r1.ebuild	2020-03-12 04:09:40.000000000 +0100
+++ /usr/portage/sys-apps/shadow/shadow-4.8.1-r1.ebuild	2020-03-13 21:04:47.091640814 +0100
@@ -152,6 +152,10 @@ 
 			newpamd "${FILESDIR}"/pam.d-include/passwd ${x}
 		done
 
+		for x in chpasswd newusers ; do
+			newpamd "${FILESDIR}"/pam.d-include/chpasswd ${x}
+		done
+
 		newpamd "${FILESDIR}"/pam.d-include/shadow-r1 groupmems
 
 		# comment out login.defs options that pam hates
--- /usr/portage/sys-apps/shadow/shadow-4.8-r3.ebuild	2020-03-12 04:09:40.000000000 +0100
+++ /usr/portage/sys-apps/shadow/shadow-4.8-r3.ebuild	2020-03-13 21:04:36.765346056 +0100
@@ -152,6 +152,10 @@ 
 			newpamd "${FILESDIR}"/pam.d-include/passwd ${x}
 		done
 
+		for x in chpasswd newusers ; do
+			newpamd "${FILESDIR}"/pam.d-include/chpasswd ${x}
+		done
+
 		newpamd "${FILESDIR}"/pam.d-include/shadow-r1 groupmems
 
 		# comment out login.defs options that pam hates