diff --git a/lib/libc/gen/Makefile.inc b/lib/libc/gen/Makefile.inc
--- a/lib/libc/gen/Makefile.inc
+++ b/lib/libc/gen/Makefile.inc
@@ -97,6 +97,7 @@
 	isinf.c \
 	isnan.c \
 	jrand48.c \
+	kqueue1.c \
 	lcong48.c \
 	libc_dlopen.c \
 	lockf.c \
diff --git a/lib/libc/gen/Symbol.map b/lib/libc/gen/Symbol.map
--- a/lib/libc/gen/Symbol.map
+++ b/lib/libc/gen/Symbol.map
@@ -436,6 +436,7 @@
 };
 
 FBSD_1.7 {
+	 kqueue1;
 	 posix_spawn_file_actions_addchdir_np;
 	 posix_spawn_file_actions_addclosefrom_np;
 	 posix_spawn_file_actions_addfchdir_np;
diff --git a/lib/libc/gen/kqueue1.c b/lib/libc/gen/kqueue1.c
new file mode 100644
--- /dev/null
+++ b/lib/libc/gen/kqueue1.c
@@ -0,0 +1,52 @@
+/*-
+ * Copyright (c) 2023 The FreeBSD Foundation
+ *
+ * This software were developed by Konstantin Belousov <kib@FreeBSD.org>
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/event.h>
+#include <errno.h>
+#include <fcntl.h>
+
+/*
+ * Provide some NetBSD compatibility.  They support a set of O_*
+ * flags, we only carry O_CLOEXEC.
+ */
+int
+kqueue1(int openflags)
+{
+	u_int flags;
+
+	if ((openflags & ~O_CLOEXEC) != 0) {
+		errno = EINVAL;
+		return (-1);
+	}
+
+	flags = 0;
+	if ((openflags & O_CLOEXEC) != 0)
+		flags |= KQUEUE_CLOEXEC;
+	return (kqueuex(flags));
+}
diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -430,7 +430,7 @@
 	jail.2 jail_set.2
 MLINKS+=kldunload.2 kldunloadf.2
 MLINKS+=kqueue.2 kevent.2 \
-	kqueue.2 kqueue1.2 \
+	kqueue.2 kqueuex.2 \
 	kqueue.2 EV_SET.3
 MLINKS+=link.2 linkat.2
 MLINKS+=madvise.2 posix_madvise.2
diff --git a/lib/libc/sys/Symbol.map b/lib/libc/sys/Symbol.map
--- a/lib/libc/sys/Symbol.map
+++ b/lib/libc/sys/Symbol.map
@@ -419,7 +419,7 @@
 FBSD_1.7 {
 	_Fork;
 	fspacectl;
-	kqueue1;
+	kqueuex;
 	swapoff;
 };
 
diff --git a/lib/libc/sys/kqueue.2 b/lib/libc/sys/kqueue.2
--- a/lib/libc/sys/kqueue.2
+++ b/lib/libc/sys/kqueue.2
@@ -38,7 +38,7 @@
 .Ft int
 .Fn kqueue "void"
 .Ft int
-.Fn kqueue1 "u_int flags"
+.Fn kqueuex "u_int flags"
 .Ft int
 .Fo kevent
 .Fa "int kq"
@@ -92,7 +92,7 @@
 which will allow sharing of the kqueue between two processes.
 .Pp
 The
-.Fn kqueue1
+.Fn kqueuex
 system call also creates a new kernel event queue, and additionally takes
 the
 .Fa flags
@@ -105,7 +105,7 @@
 The
 .Ql fd = kqueue()
 call is equivalent to
-.Ql fd = kqueue1(0) .
+.Ql fd = kqueuex(0) .
 .Pp
 The
 .Fn kevent
diff --git a/sys/kern/kern_event.c b/sys/kern/kern_event.c
--- a/sys/kern/kern_event.c
+++ b/sys/kern/kern_event.c
@@ -1058,7 +1058,7 @@
 }
 
 int
-sys_kqueue1(struct thread *td, struct kqueue1_args *uap)
+sys_kqueuex(struct thread *td, struct kqueuex_args *uap)
 {
 	int flags;
 
diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
--- a/sys/kern/syscalls.master
+++ b/sys/kern/syscalls.master
@@ -3307,7 +3307,7 @@
 		);
 	}
 583	AUE_KQUEUE	STD|CAPENABLED {
-		int kqueue1(
+		int kqueuex(
 		    u_int flags
 		);
 	}
diff --git a/sys/sys/event.h b/sys/sys/event.h
--- a/sys/sys/event.h
+++ b/sys/sys/event.h
@@ -218,7 +218,7 @@
 #define NOTE_NSECONDS		0x00000008	/* data is nanoseconds */
 #define	NOTE_ABSTIME		0x00000010	/* timeout is absolute */
 
-/* Flags for kqueue1(2) */
+/* Flags for kqueuex(2) */
 #define	KQUEUE_CLOEXEC	0x00000001	/* close on exec */
 
 struct knote;
@@ -361,7 +361,8 @@
 
 __BEGIN_DECLS
 int     kqueue(void);
-int     kqueue1(unsigned flags);
+int     kqueuex(unsigned flags);
+int     kqueue1(int flags);
 int     kevent(int kq, const struct kevent *changelist, int nchanges,
 	    struct kevent *eventlist, int nevents,
 	    const struct timespec *timeout);