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diff --git a/lib/Makefile b/lib/Makefile
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -90,6 +90,7 @@
librss \
librt \
librtld_db \
+ libsbrk \
libsbuf \
libsmb \
libstdbuf \
diff --git a/lib/libsbrk/Makefile b/lib/libsbrk/Makefile
new file mode 100644
--- /dev/null
+++ b/lib/libsbrk/Makefile
@@ -0,0 +1,11 @@
+PACKAGE= clibs
+LIB= sbrk
+SHLIB_MAJOR= 1
+
+LDFLAGS+=-Wl,--filter=libc.so.7
+VERSION_DEF=${SRCTOP}/lib/libc/Versions.def
+SYMBOL_MAPS=${.CURDIR}/Symbol.map
+
+SRCS= ${LIB}.c
+
+.include <bsd.lib.mk>
diff --git a/lib/libsbrk/Symbol.map b/lib/libsbrk/Symbol.map
new file mode 100644
--- /dev/null
+++ b/lib/libsbrk/Symbol.map
@@ -0,0 +1,3 @@
+FBSD_1.0 {
+ sbrk;
+};
diff --git a/lib/libsbrk/sbrk.c b/lib/libsbrk/sbrk.c
new file mode 100644
--- /dev/null
+++ b/lib/libsbrk/sbrk.c
@@ -0,0 +1,44 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2023 SRI International
+ *
+ * This software was developed by SRI International, the University of
+ * Cambridge Computer Laboratory (Department of Computer Science and
+ * Technology), and Capabilities Limited under Defense Advanced Research
+ * Projects Agency (DARPA) Contract No. HR001122S0003 ("MTSS").
+ *
+ * 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 <inttypes.h>
+
+void *sbrk(intptr_t);
+void *libc_sbrk(intptr_t);
+
+asm (".symver libc_sbrk, sbrk@FBSD_1.0");
+
+void *
+sbrk(intptr_t incr)
+{
+ return (libc_sbrk(incr));
+}
diff --git a/lib/libsys/brk.2 b/lib/libsys/brk.2
--- a/lib/libsys/brk.2
+++ b/lib/libsys/brk.2
@@ -33,7 +33,7 @@
.Nm sbrk
.Nd change data segment size
.Sh LIBRARY
-.Lb libc
+.Lb libsbrk
.Sh SYNOPSIS
.In unistd.h
.Ft int
@@ -81,6 +81,11 @@
function
sets the break to
.Fa addr .
+.Bf -symbolic
+It is implemented in the
+.Lb libc
+as a compatibility symbol and no mechanism is provided to link it.
+.Ef
.Pp
The
.Fn sbrk
@@ -95,6 +100,12 @@
the break is lowered by
.Fa incr
bytes.
+.Bf -symbolic
+It is implemented in the
+.Lb libc
+as a compatibility symbol and can be linked via the
+.Lb libsbrk .
+.Ef
.Sh NOTES
While the actual process data segment size maintained by the kernel will only
grow or shrink in page sizes, these functions allow setting the break

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