diff -up at-3.1.11/at.1.in.typo at-3.1.11/at.1.in
--- at-3.1.11/at.1.in.typo	2009-08-14 12:49:05.000000000 -0400
+++ at-3.1.11/at.1.in	2009-09-29 13:11:37.869869479 -0400
@@ -89,7 +89,9 @@ or giving a date of the form
 or
 .B MM/DD/YY
 or
-.B DD.MM.YY.
+.B DD.MM.YY
+or
+.B YYYY-MM-DD.
 The specification of a date
 .I must
 follow the specification of the time of day.
@@ -119,7 +121,7 @@ and to run a job at 1am tomorrow, you wo
 .B at 1am tomorrow.
 .PP
 The exact definition of the time specification can be found in
-.IR @prefix@/share/doc/at/timespec .
+.IR @prefix@/share/doc/at-@VERSION@/timespec .
 .PP
 For both
 .BR at " and " batch ,
diff -up at-3.1.11/atd.c.typo at-3.1.11/atd.c
--- at-3.1.11/atd.c.typo	2009-09-29 13:02:17.068860987 -0400
+++ at-3.1.11/atd.c	2009-09-29 13:02:17.099881137 -0400
@@ -276,6 +276,8 @@ run_file(const char *filename, uid_t uid
 	free(newname);
 	return;
     }
+    (void) setsid(); //own session for process
+
     /* Let's see who we mail to.  Hopefully, we can read it from
      * the command file; if not, send it to the owner, or, failing that,
      * to root.
@@ -497,7 +499,7 @@ run_file(const char *filename, uid_t uid
 #if defined(SENDMAIL)
 	    execl(SENDMAIL, "sendmail", mailname, (char *) NULL);
 #else
-#error      "No mail command specified."
+	    perr("No mail command specified.");
 #endif
 	    perr("Exec failed for mail command");
 
@@ -606,6 +608,7 @@ run_loop()
 		 * Let's remove the lockfile and reschedule.
 		 */
 		strncpy(lock_name, dirent->d_name, sizeof(lock_name));
+		lock_name[sizeof(lock_name)-1] = '\0';
 		lock_name[0] = '=';
 		unlink(lock_name);
 		next_job = now;
@@ -640,6 +643,7 @@ run_loop()
 	    run_batch++;
 	    if (strcmp(batch_name, dirent->d_name) > 0) {
 		strncpy(batch_name, dirent->d_name, sizeof(batch_name));
+		batch_name[sizeof(batch_name)-1] = '\0';
 		batch_uid = buf.st_uid;
 		batch_gid = buf.st_gid;
 		batch_queue = queue;

diff -up at-3.1.11/configure.ac.aaa at-3.1.11/configure.ac
--- at-3.1.11/configure.ac.aaa	2009-08-14 12:49:05.000000000 -0400
+++ at-3.1.11/configure.ac	2009-09-29 13:35:59.230866054 -0400
@@ -5,7 +5,7 @@ AC_CONFIG_SRCDIR(at.c)
 
 AC_PREFIX_DEFAULT(/usr)
 AC_CONFIG_HEADER(config.h)
-AC_PREREQ([2.64])
+AC_PREREQ([2.63])
 
 VERSION=AC_PACKAGE_VERSION
 if test "X$CFLAGS" = "X"; then
diff -up at-3.1.11/atd.c.seg at-3.1.11/atd.c
--- at-3.1.11/atd.c.seg	2009-08-14 12:49:05.000000000 -0400
+++ at-3.1.11/atd.c	2009-09-29 12:15:55.200864618 -0400
@@ -435,6 +435,9 @@ run_file(const char *filename, uid_t uid
 	    if (setuid(uid) < 0)
 		perr("Cannot set user id");
 
+	    if (SIG_ERR == signal(SIGCHLD, SIG_DFL))
+		perr("Cannot reset signal handler to default");
+
 	    chdir("/");
 
 	    if (execle("/bin/sh", "sh", (char *) NULL, nenvp) != 0)