diff --git a/build-aux/configure-lib.sh b/build-aux/configure-lib.sh
index 8f7b8cb1..71ac5a62 100644
--- a/build-aux/configure-lib.sh
+++ b/build-aux/configure-lib.sh
@@ -375,6 +375,7 @@ lib/stub/frexp.c
 lib/stub/getgrgid.c
 lib/stub/getgrnam.c
 lib/stub/getlogin.c
+lib/stub/getpagesize.c
 lib/stub/getpgid.c
 lib/stub/getpgrp.c
 lib/stub/getpwnam.c
diff --git a/include/limits.h b/include/limits.h
index 9cbbf97a..8ef34dc8 100644
--- a/include/limits.h
+++ b/include/limits.h
@@ -1,6 +1,6 @@
 /* -*-comment-start: "//";comment-end:""-*-
  * GNU Mes --- Maxwell Equations of Software
- * Copyright © 2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ * Copyright © 2017,2018,2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
  *
  * This file is part of GNU Mes.
  *
@@ -33,6 +33,7 @@
 
 #define MB_CUR_MAX 1
 #define NAME_MAX 255
+#define PAGE_SIZE 4096
 #define PATH_MAX 512
 #define _POSIX_OPEN_MAX 16
 
diff --git a/include/unistd.h b/include/unistd.h
index 2b1ac6cf..da566fbb 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -74,6 +74,7 @@ int setgid (gid_t newgid);
 int setuid (uid_t newuid);
 uid_t geteuid (void);
 gid_t getegid (void);
+int getpagesize (void);
 pid_t getpgrp (void);
 pid_t getpid (void);
 pid_t getppid (void);
diff --git a/lib/stub/getpagesize.c b/lib/stub/getpagesize.c
new file mode 100644
index 00000000..3e69dc7a
--- /dev/null
+++ b/lib/stub/getpagesize.c
@@ -0,0 +1,32 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mes/lib.h>
+#include <limits.h>
+
+int
+getpagesize (void)
+{
+  static int stub = 0;
+  if (__mes_debug () && !stub)
+    eputs ("getpagesize stub\n");
+  stub = 1;
+  return PAGE_SIZE;
+}