diff --git a/ChangeLog b/ChangeLog
index 293a554c9f5..84d88fa7f1a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-03-06  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* configure.ac (TERM_HEADER): Remove duplicate definition (Bug#13872).
+	It can mess up 'configure' runs.
+
 2013-03-05  Glenn Morris  <rgm@gnu.org>
 
 	* Makefile.in (install-man): Ignore gzip exit status.
diff --git a/configure.ac b/configure.ac
index 76a99cb9856..aed625e44a9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1580,11 +1580,6 @@ dnl use the toolkit if we have gtk, or X11R5 or newer.
   ;;
 esac
 
-if test -n "${term_header}"; then
-    AC_DEFINE_UNQUOTED(TERM_HEADER, "${term_header}",
-        [Define to the header for the built-in window system.])
-fi
-
 if test "$window_system" = none && test "X$with_x" != "Xno"; then
    AC_CHECK_PROG(HAVE_XSERVER, X, true, false)
    if test "$HAVE_XSERVER" = true ||
diff --git a/src/ChangeLog b/src/ChangeLog
index 84ba55e3bdf..bbf2aae960a 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,15 @@
+2013-03-06  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Fix a build failure on OpenBSD 4.x and MirBSD (Bug#13881).
+	* sysdep.c (list_system_processes)
+	[BSD_SYSTEM && !DARWIN_OS && !__FreeBSD__]:
+	Make it a stub in this case; otherwise the build might fail,
+	and this code hasn't been tested on such hosts anyway.
+	Problem reported by Nelson H. F. Beebe in
+	<http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00021.html>
+	and analyzed by Jérémie Courrèges-Anglas in
+	<http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00062.html>.
+
 2013-03-06  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	* lisp.h (find_next_newline_no_quit): Rename to find_next_newline.
@@ -65,16 +77,6 @@
 	to be in sync with bidi_it->bytepos.  Suggested by Dmitry Antipov
 	<dmantipov@yandex.ru>.
 
-2013-03-05  Paul Eggert  <eggert@cs.ucla.edu>
-
-	Fix a build failure on OpenBSD 4.x and MirBSD.
-	* sysdep.c (KERN_PROC, kinfo_proc)
-	[BSD_SYSTEM && (!KERN_PROC || __MirBSD__)]:
-	Define to KERN_PROC2 and kinfo_proc2, for OpenBSD 4.9 and MirBSD.
-	list-system-processes still returns nil, but at least it doesn't crash.
-	Problem reported by Nelson H. F. Beebe in
-	<http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00021.html>.
-
 2013-03-05  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	* composite.c (get_composition_id, fill_gstring_header):
diff --git a/src/sysdep.c b/src/sysdep.c
index c4b937183ca..fe6371623a9 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -2541,20 +2541,12 @@ list_system_processes (void)
   return proclist;
 }
 
-#elif defined BSD_SYSTEM
-
-/* OpenBSD 4.9 and earlier do not have KERN_PROC.  Approximate it with
-   KERN_PROC2.  MirBSD's KERN_PROC seems to be busted.  */
-# if !defined KERN_PROC || defined __MirBSD__
-#  undef KERN_PROC
-#  define KERN_PROC KERN_PROC2
-#  define kinfo_proc kinfo_proc2
-# endif
+#elif defined DARWIN_OS || defined __FreeBSD__
 
 Lisp_Object
 list_system_processes (void)
 {
-#if defined DARWIN_OS || defined __NetBSD__ || defined __OpenBSD__
+#ifdef DARWIN_OS
   int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL};
 #else
   int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_PROC};
@@ -2580,10 +2572,8 @@ list_system_processes (void)
   len /= sizeof (struct kinfo_proc);
   for (i = 0; i < len; i++)
     {
-#if defined DARWIN_OS || defined __NetBSD__
+#ifdef DARWIN_OS
       proclist = Fcons (make_fixnum_or_float (procs[i].kp_proc.p_pid), proclist);
-#elif defined __OpenBSD__
-      proclist = Fcons (make_fixnum_or_float (procs[i].p_pid), proclist);
 #else
       proclist = Fcons (make_fixnum_or_float (procs[i].ki_pid), proclist);
 #endif