--- src/vsyslog.c.ORIG	1969-12-31 19:00:00 +0000
+++ src/vsyslog.c	2021-11-25 00:49:50 +0000
@@ -0,0 +1,54 @@
+/*    $Id: vsyslog.c,v 1.2 2000/09/20 03:42:30 robert Exp $
+ *
+ * Copyright (c) 1994-1996 Sam Leffler
+ * Copyright (c) 1994-1996 Silicon Graphics, Inc.
+ * HylaFAX is a trademark of Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the names of
+ * Sam Leffler and Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Sam Leffler and Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+#include <stdio.h>
+#include <sys/types.h>
+#include <stdarg.h>
+#include <syslog.h>
+#include <string.h>
+#include <errno.h>
+
+void
+vsyslog(int pri, const char* fmt, va_list ap)
+{
+      char tbuf[2048], fmt_cpy[1024];
+      char* cp;
+      char c;
+
+      /* substitute error message for %m */
+      for (cp = fmt_cpy; c = *fmt; ++fmt) {
+          if (c == '%' && fmt[1] == 'm') {
+              const char* dp;
+              ++fmt;
+              for (dp = strerror(errno); *cp = *dp++; ++cp)
+                  ;
+          } else
+              *cp+= c;
+          *cp = '\0';
+      }
+      (void) vsnprintf(tbuf, sizeof(tbuf), fmt_cpy, ap);
+      (void) syslog(pri, "%s", tbuf);
+}
+
--- src/rrd_utils.c.ORIG	2021-11-25 00:53:46 +0000
+++ src/rrd_utils.c	2021-11-25 00:55:11 +0000
@@ -44,6 +44,10 @@
 #define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
 #endif
 
+#ifdef _AIX
+#include "vsyslog.c"
+#endif
+
 /* make sure that the random number generator seeded EXACTLY ONCE */
 long rrd_random(void)
 {