$(mkdir_p) is obsolete for newer automake, use $(MKDIR_P) instead.
Upstream should really gettextize with a newer version before packing up.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura Linux-PAM-1.1.7.orig/po/Makefile.in.in Linux-PAM-1.1.7/po/Makefile.in.in
--- Linux-PAM-1.1.7.orig/po/Makefile.in.in	2013-09-11 20:45:16.610770002 -0300
+++ Linux-PAM-1.1.7/po/Makefile.in.in	2013-09-11 20:45:28.030145316 -0300
@@ -31,7 +31,7 @@
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
 mkinstalldirs = $(SHELL) @install_sh@ -d
-mkdir_p = @mkdir_p@
+mkdir_p = @MKDIR_P@
 
 GMSGFMT_ = @GMSGFMT@
 GMSGFMT_no = @GMSGFMT@