diff --git a/alsactl/alsactl.c b/alsactl/alsactl.c
index ae73715..2851441 100644
--- a/alsactl/alsactl.c
+++ b/alsactl/alsactl.c
@@ -30,6 +30,7 @@
 #include <syslog.h>
 #include <sched.h>
 #include "alsactl.h"
+#include "os_compat.h"
 
 #ifndef SYS_ASOUND_DIR
 #define SYS_ASOUND_DIR "/var/lib/alsa"
diff --git a/alsaloop/alsaloop.c b/alsaloop/alsaloop.c
index f5f2e37..e0f8642 100644
--- a/alsaloop/alsaloop.c
+++ b/alsaloop/alsaloop.c
@@ -33,6 +33,7 @@
 #include <syslog.h>
 #include <signal.h>
 #include "alsaloop.h"
+#include "os_compat.h"
 
 struct loopback_thread {
 	int threaded;
diff --git a/alsaloop/control.c b/alsaloop/control.c
index cf5693b..ba891fd 100644
--- a/alsaloop/control.c
+++ b/alsaloop/control.c
@@ -24,7 +24,9 @@
 #include <ctype.h>
 #include <syslog.h>
 #include <alsa/asoundlib.h>
+#include <sys/time.h>
 #include "alsaloop.h"
+#include "os_compat.h"
 
 static char *id_str(snd_ctl_elem_id_t *id)
 {
diff --git a/alsaloop/pcmjob.c b/alsaloop/pcmjob.c
index ef0c3dd..2df7bbd 100644
--- a/alsaloop/pcmjob.c
+++ b/alsaloop/pcmjob.c
@@ -33,6 +33,7 @@
 #include <syslog.h>
 #include <pthread.h>
 #include "alsaloop.h"
+#include "os_compat.h"
 
 #define XRUN_PROFILE_UNKNOWN (-10000000)
 
diff --git a/amidi/amidi.c b/amidi/amidi.c
index b7eebdf..ae2143c 100644
--- a/amidi/amidi.c
+++ b/amidi/amidi.c
@@ -85,7 +85,9 @@ static void usage(void)
 		"-T, --timestamp=...             adds a timestamp in front of each dumped message\n"
 		"                realtime\n"
 		"                monotonic\n"
+#ifdef CLOCK_MONOTONIC_RAW
 		"                raw\n"
+#endif
 		"-t, --timeout=seconds           exits when no data has been received\n"
 		"                                for the specified duration\n"
 		"-a, --active-sensing            include active sensing bytes\n"
@@ -534,8 +536,10 @@ int main(int argc, char *argv[])
 				cid = CLOCK_REALTIME;
 			else if (strcasecmp(optarg, "monotonic") == 0)
 				cid = CLOCK_MONOTONIC;
+#ifdef CLOCK_MONOTONIC_RAW
 			else if (strcasecmp(optarg, "raw") == 0)
 				cid = CLOCK_MONOTONIC_RAW;
+#endif
 			else
 				error("Clock type not known");
 			break;
diff --git a/aplay/aplay.c b/aplay/aplay.c
index 6c4c67b..d6b2e80 100644
--- a/aplay/aplay.c
+++ b/aplay/aplay.c
@@ -29,7 +29,9 @@
 #define _GNU_SOURCE
 #include "aconfig.h"
 #include <stdio.h>
+#if HAVE_MALLOC_H
 #include <malloc.h>
+#endif
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
@@ -53,6 +55,7 @@
 #include "gettext.h"
 #include "formats.h"
 #include "version.h"
+#include "os_compat.h"
 
 #define ABS(a)  (a) < 0 ? -(a) : (a)
 
diff --git a/aplay/formats.h b/aplay/formats.h
index ac0a2b0..093ab80 100644
--- a/aplay/formats.h
+++ b/aplay/formats.h
@@ -1,8 +1,7 @@
 #ifndef FORMATS_H
 #define FORMATS_H		1
 
-#include <endian.h>
-#include <byteswap.h>
+#include "bswap.h"
 
 /* Definitions for .VOC files */
 
diff --git a/axfer/container.h b/axfer/container.h
index f6ce689..8f7ab2a 100644
--- a/axfer/container.h
+++ b/axfer/container.h
@@ -17,6 +17,8 @@
 
 #include <alsa/asoundlib.h>
 
+#include "os_compat.h"
+
 enum container_type {
 	CONTAINER_TYPE_PARSER = 0,
 	CONTAINER_TYPE_BUILDER,
diff --git a/bat/alsa.c b/bat/alsa.c
index 0d0af0d..f0adbc3 100644
--- a/bat/alsa.c
+++ b/bat/alsa.c
@@ -28,6 +28,7 @@
 #include "common.h"
 #include "alsa.h"
 #include "latencytest.h"
+#include "os_compat.h"
 
 struct pcm_container {
 	snd_pcm_t *handle;
diff --git a/configure.ac b/configure.ac
index de51b78..d3cd904 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,7 +28,7 @@ AC_CHECK_FUNC([snd_ctl_elem_add_enumerated],
 fi
 
 
-AC_CHECK_HEADERS([dlfcn.h])
+AC_CHECK_HEADERS([dlfcn.h malloc.h])
 
 dnl Check components
 AC_CHECK_HEADERS([alsa/pcm.h], [have_pcm="yes"], [have_pcm="no"],
diff --git a/include/bswap.h b/include/bswap.h
new file mode 100644
index 0000000..e590124
--- /dev/null
+++ b/include/bswap.h
@@ -0,0 +1,44 @@
+/*
+ *  ALSA lib - compatibility header for providing byte swapping macros
+ *  Copyright (c) 2016 by  Thomas Klausner <wiz@NetBSD.org>
+ *
+ *
+ *   This library is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Lesser General Public License as
+ *   published by the Free Software Foundation; either version 2.1 of
+ *   the License, or (at your option) any later version.
+ *
+ *   This program 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 Lesser General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Lesser General Public
+ *   License along with this library; if not, write to the Free Software
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef __BSWAP_H
+#define __BSWAP_H
+
+#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
+#include <sys/endian.h>
+#define bswap_16 bswap16
+#define bswap_32 bswap32
+#define bswap_64 bswap64
+#elif defined(__OpenBSD__)
+#include <sys/endian.h>
+#define bswap_16 swap16
+#define bswap_32 swap32
+#define bswap_64 swap64
+#elif defined (__sun)
+#include <sys/byteorder.h>
+#define bswap_16 BSWAP_16
+#define bswap_32 BSWAP_32
+#define bswap_64 BSWAP_64
+#else
+#include <byteswap.h>
+#endif
+
+#endif
diff --git a/include/os_compat.h b/include/os_compat.h
new file mode 100644
index 0000000..8d4f041
--- /dev/null
+++ b/include/os_compat.h
@@ -0,0 +1,43 @@
+/*
+ * ALSA lib - compatibility header for supporting various OSes
+ * Copyright (C) 2022 by Takayoshi SASANO <uaa@cvs.openbsd.org>
+ *
+ *
+ *   This library is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Lesser General Public License as
+ *   published by the Free Software Foundation; either version 2.1 of
+ *   the License, or (at your option) any later version.
+ *
+ *   This program 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 Lesser General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Lesser General Public
+ *   License along with this library; if not, write to the Free Software
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef __OS_COMPAT_H
+#define __OS_COMPAT_H
+
+#ifndef ESTRPIPE
+#define ESTRPIPE ESPIPE
+#endif
+
+#ifndef ERESTART
+#define ERESTART EINTR
+#endif
+
+#ifndef SCHED_IDLE
+#define SCHED_IDLE SCHED_OTHER
+#endif
+
+#if defined(__OpenBSD__)
+/* these functions in <sched.h> are not implemented */
+#define sched_getparam(pid, param) (-1)
+#define sched_setscheduler(pid, policy, param) (-1)
+#endif
+
+#endif
diff --git a/speaker-test/speaker-test.c b/speaker-test/speaker-test.c
index fd13d88..d08893a 100644
--- a/speaker-test/speaker-test.c
+++ b/speaker-test/speaker-test.c
@@ -44,7 +44,7 @@
 #include <getopt.h>
 #include <inttypes.h>
 #include <ctype.h>
-#include <byteswap.h>
+#include "bswap.h"
 #include <signal.h>
 
 #define ALSA_PCM_NEW_HW_PARAMS_API
@@ -56,6 +56,7 @@
 #include "aconfig.h"
 #include "gettext.h"
 #include "version.h"
+#include "os_compat.h"
 
 #ifdef ENABLE_NLS
 #include <locale.h>