diff --git a/build-aux/configure-lib.sh b/build-aux/configure-lib.sh
index eb320a66..16d1cb68 100644
--- a/build-aux/configure-lib.sh
+++ b/build-aux/configure-lib.sh
@@ -359,6 +359,7 @@ lib/string/strncat.c
 lib/string/strpbrk.c
 lib/string/strspn.c
 lib/stub/__cleanup.c
+lib/stub/asctime.c
 lib/stub/atan2.c
 lib/stub/bsearch.c
 lib/stub/chown.c
diff --git a/include/time.h b/include/time.h
index 189200a1..7b3e3d13 100644
--- a/include/time.h
+++ b/include/time.h
@@ -56,6 +56,7 @@ struct timespec
 #endif // __MES_STRUCT_TIMESPEC
 
 #define CLOCK_PROCESS_CPUTIME_ID 2
+char *asctime (struct tm const *broken_time);
 int clock_gettime (clockid_t clk_id, struct timespec *tp);
 struct tm *localtime (time_t const *timep);
 struct tm *gmtime (time_t const *time);
diff --git a/lib/stub/asctime.c b/lib/stub/asctime.c
new file mode 100644
index 00000000..65eb9783
--- /dev/null
+++ b/lib/stub/asctime.c
@@ -0,0 +1,33 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2019 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 <time.h>
+
+char *
+asctime (struct tm const *broken_time)
+{
+  static int stub = 0;
+  if (__mes_debug () && !stub)
+    eputs ("asctime stub\n");
+  stub = 1;
+  errno = 0;
+  return "now";
+}