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the Makefile.am manualy adds man_nopam to the install list, and then also
optionally appends it which leads to the `install` error:
	... will not overwrite just-created ...
http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/sys-apps/shadow/files/shadow-4.1.4.3-dup-install-targets.patch?view=markup

--- shadow-4.1.4.3/man/ru/Makefile.in
+++ shadow-4.1.4.3/man/ru/Makefile.in
@@ -222,7 +222,7 @@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
-man_MANS = $(man_nopam) chage.1 chfn.1 chgpasswd.8 chpasswd.8 chsh.1 \
+man_MANS = chage.1 chfn.1 chgpasswd.8 chpasswd.8 chsh.1 \
 	expiry.1 faillog.5 faillog.8 getspnam.3 gpasswd.1 groupadd.8 \
 	groupdel.8 groupmems.8 groupmod.8 groups.1 grpck.8 grpconv.8 \
 	grpunconv.8 gshadow.5 lastlog.8 login.1 login.defs.5 logoutd.8 \