diff --git a/include/unistd.h b/include/unistd.h
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -467,13 +467,17 @@
 #endif /* __XSI_VISIBLE */
 
 #if (__XSI_VISIBLE && __XSI_VISIBLE <= 500) || __BSD_VISIBLE
+#ifdef _WANT_BRK
 int	 brk(const void *);
+#endif
 int	 chroot(const char *);
 int	 getdtablesize(void);
 int	 getpagesize(void) __pure2;
 char	*getpass(const char *);
+#ifdef _WANT_SBRK
 void	*sbrk(intptr_t);
 #endif
+#endif
 
 #if (__XSI_VISIBLE && __XSI_VISIBLE <= 600) || __BSD_VISIBLE
 char	*getwd(char *);			/* obsoleted by getcwd() */
diff --git a/lib/libc/amd64/Symbol.map b/lib/libc/amd64/Symbol.map
--- a/lib/libc/amd64/Symbol.map
+++ b/lib/libc/amd64/Symbol.map
@@ -6,7 +6,6 @@
 FBSD_1.0 {
 	.mcount;
 	__flt_rounds;
-	brk;
 	fpgetmask;
 	fpgetprec;
 	fpgetround;
@@ -14,7 +13,6 @@
 	fpsetmask;
 	fpsetprec;
 	fpsetround;
-	sbrk;
 };
 
 /*
@@ -28,5 +26,4 @@
 	__signalcontext;
 	signalcontext;
 	__siglongjmp;
-	_brk;
 };
diff --git a/lib/libc/arm/Symbol.map b/lib/libc/arm/Symbol.map
--- a/lib/libc/arm/Symbol.map
+++ b/lib/libc/arm/Symbol.map
@@ -6,8 +6,6 @@
 FBSD_1.0 {
 	__mcount;
 	alloca;
-	brk;
-	sbrk;
 };
 
 FBSD_1.3 {
@@ -25,7 +23,6 @@
 };
 
 FBSDprivate_1.0 {
-	_brk;
 	__aeabi_read_tp;
 	___longjmp;
 	__longjmp;
diff --git a/lib/libc/i386/Symbol.map b/lib/libc/i386/Symbol.map
--- a/lib/libc/i386/Symbol.map
+++ b/lib/libc/i386/Symbol.map
@@ -5,10 +5,8 @@
  */
 FBSD_1.0 {
 	.mcount;
-	brk;
 	__flt_rounds;
 	___tls_get_addr;
-	sbrk;
 };
 
 FBSDprivate_1.0 {
@@ -17,5 +15,4 @@
 	__signalcontext;
 	signalcontext;
 	__siglongjmp;
-	_brk;
 };
diff --git a/lib/libc/powerpc/Symbol.map b/lib/libc/powerpc/Symbol.map
--- a/lib/libc/powerpc/Symbol.map
+++ b/lib/libc/powerpc/Symbol.map
@@ -6,13 +6,11 @@
 FBSD_1.0 {
 	_mcount;
 	__flt_rounds;
-	brk;
 	fpgetmask;
 	fpgetround;
 	fpgetsticky;
 	fpsetmask;
 	fpsetround;
-	sbrk;
 };
 
 FBSD_1.3 {
diff --git a/lib/libc/powerpc64/Symbol.map b/lib/libc/powerpc64/Symbol.map
--- a/lib/libc/powerpc64/Symbol.map
+++ b/lib/libc/powerpc64/Symbol.map
@@ -6,11 +6,9 @@
 FBSD_1.0 {
 	_mcount;
 	__flt_rounds;
-	brk;
 	fpgetmask;
 	fpgetround;
 	fpgetsticky;
 	fpsetmask;
 	fpsetround;
-	sbrk;
 };
diff --git a/lib/libc/sys/brk.c b/lib/libc/sys/brk.c
--- a/lib/libc/sys/brk.c
+++ b/lib/libc/sys/brk.c
@@ -31,7 +31,11 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-void *__sys_break(char *nsize);
+int __freebsd14__brk(const void *addr);
+int __freebsd14_brk(const void *addr);
+void *__freebsd14_sbrk(intptr_t incr);
+
+void *freebsd14_break(char *nsize);
 
 static uintptr_t curbrk, minbrk;
 static int curbrk_initted;
@@ -42,7 +46,7 @@
 	void *newbrk;
 
 	if (!curbrk_initted) {
-		newbrk = __sys_break(NULL);
+		newbrk = freebsd14_break(NULL);
 		if (newbrk == (void *)-1)
 			return (-1);
 		curbrk = minbrk = (uintptr_t)newbrk;
@@ -61,7 +65,7 @@
 		errno = EINVAL;
 		return ((void *)-1);
 	}
-	if (__sys_break(addr) == (void *)-1)
+	if (freebsd14_break(addr) == (void *)-1)
 		return ((void *)-1);
 	oldbrk = curbrk;
 	curbrk = (uintptr_t)addr;
@@ -69,7 +73,7 @@
 }
 
 int
-brk(const void *addr)
+__freebsd14_brk(const void *addr)
 {
 
 	if (initbrk() == -1)
@@ -78,18 +82,22 @@
 		addr = (void *)minbrk;
 	return (mvbrk(__DECONST(void *, addr)) == (void *)-1 ? -1 : 0);
 }
+__sym_compat(brk, __freebsd14_brk, FBSD_1.0);
 
+#if defined(__amd64__) || defined(__arm__) || defined(__i386__)
 int
-_brk(const void *addr)
+__freebsd14__brk(const void *addr)
 {
 
 	if (initbrk() == -1)
 		return (-1);
 	return (mvbrk(__DECONST(void *, addr)) == (void *)-1 ? -1 : 0);
 }
+__sym_compat(_brk, __freebsd14__brk, FBSD_1.0);
+#endif
 
 void *
-sbrk(intptr_t incr)
+__freebsd14_sbrk(intptr_t incr)
 {
 
 	if (initbrk() == -1)
@@ -102,3 +110,4 @@
 	}
 	return (mvbrk((void *)(curbrk + incr)));
 }
+__sym_compat(sbrk, __freebsd14_sbrk, FBSD_1.0);
diff --git a/lib/libc/tests/sys/brk_test.c b/lib/libc/tests/sys/brk_test.c
--- a/lib/libc/tests/sys/brk_test.c
+++ b/lib/libc/tests/sys/brk_test.c
@@ -35,6 +35,15 @@
 
 #include <atf-c.h>
 
+int libc_brk(const void *addr);
+void *libc_sbrk(intptr_t incr);
+
+asm (".symver libc_brk, brk@FBSD_1.0");
+asm (".symver libc_sbrk, sbrk@FBSD_1.0");
+
+#define	brk	libc_brk
+#define	sbrk	libc_sbrk
+
 ATF_TC(brk_basic);
 ATF_TC_HEAD(brk_basic, tc)
 {
diff --git a/lib/libsys/_libsys.h b/lib/libsys/_libsys.h
--- a/lib/libsys/_libsys.h
+++ b/lib/libsys/_libsys.h
@@ -77,7 +77,6 @@
 typedef int (__sys_fchdir_t)(int);
 typedef int (__sys_chmod_t)(const char *, mode_t);
 typedef int (__sys_chown_t)(const char *, int, int);
-typedef void * (__sys_break_t)(char *);
 typedef pid_t (__sys_getpid_t)(void);
 typedef int (__sys_mount_t)(const char *, const char *, int, void *);
 typedef int (__sys_unmount_t)(const char *, int);
@@ -477,7 +476,6 @@
 int __sys_fchdir(int fd);
 int __sys_chmod(const char * path, mode_t mode);
 int __sys_chown(const char * path, int uid, int gid);
-void * __sys_break(char * nsize);
 pid_t __sys_getpid(void);
 int __sys_mount(const char * type, const char * path, int flags, void * data);
 int __sys_unmount(const char * path, int flags);
diff --git a/lib/libsys/brk.2 b/lib/libsys/brk.2
--- a/lib/libsys/brk.2
+++ b/lib/libsys/brk.2
@@ -48,10 +48,21 @@
 .Fn sbrk
 functions are legacy interfaces from before the
 advent of modern virtual memory management.
-They are deprecated and not present on the arm64 or riscv architectures.
+They are deprecated and no longer declared or directly linkable in the
+.Lb libc
+as of
+.Fx 15.0 .
 The
 .Xr mmap 2
 interface should be used to allocate pages instead.
+.Pp
+The kernel may not support the underlying system call require to
+implement
+.Fn brk
+and
+.Fn sbrk
+depending on its configuration.
+This is always the case on the aarch64 and riscv architectures.
 .Ef
 .Pp
 The
diff --git a/lib/libsys/syscalls.map b/lib/libsys/syscalls.map
--- a/lib/libsys/syscalls.map
+++ b/lib/libsys/syscalls.map
@@ -32,8 +32,6 @@
 	__sys_chmod;
 	_chown;
 	__sys_chown;
-	_break;
-	__sys_break;
 	_getpid;
 	__sys_getpid;
 	_mount;
diff --git a/sys/compat/freebsd32/freebsd32_syscall.h b/sys/compat/freebsd32/freebsd32_syscall.h
--- a/sys/compat/freebsd32/freebsd32_syscall.h
+++ b/sys/compat/freebsd32/freebsd32_syscall.h
@@ -21,7 +21,7 @@
 #define	FREEBSD32_SYS_freebsd11_mknod	14
 #define	FREEBSD32_SYS_chmod	15
 #define	FREEBSD32_SYS_chown	16
-#define	FREEBSD32_SYS_break	17
+#define	FREEBSD32_SYS_freebsd14_break	17
 				/* 18 is freebsd4 freebsd32_getfsstat */
 				/* 19 is old freebsd32_lseek */
 #define	FREEBSD32_SYS_getpid	20
diff --git a/sys/compat/freebsd32/freebsd32_syscalls.c b/sys/compat/freebsd32/freebsd32_syscalls.c
--- a/sys/compat/freebsd32/freebsd32_syscalls.c
+++ b/sys/compat/freebsd32/freebsd32_syscalls.c
@@ -22,7 +22,7 @@
 	"compat11.mknod",		/* 14 = freebsd11 mknod */
 	"chmod",			/* 15 = chmod */
 	"chown",			/* 16 = chown */
-	"break",			/* 17 = break */
+	"compat14.break",		/* 17 = freebsd14 break */
 	"compat4.freebsd32_getfsstat",		/* 18 = freebsd4 freebsd32_getfsstat */
 	"compat.freebsd32_lseek",		/* 19 = old freebsd32_lseek */
 	"getpid",			/* 20 = getpid */
diff --git a/sys/compat/freebsd32/freebsd32_sysent.c b/sys/compat/freebsd32/freebsd32_sysent.c
--- a/sys/compat/freebsd32/freebsd32_sysent.c
+++ b/sys/compat/freebsd32/freebsd32_sysent.c
@@ -59,6 +59,12 @@
 #define compat13(n, name) .sy_narg = 0, .sy_call = (sy_call_t *)nosys
 #endif
 
+#ifdef COMPAT_FREEBSD14
+#define compat14(n, name) .sy_narg = n, .sy_call = (sy_call_t *)__CONCAT(freebsd14_, name)
+#else
+#define compat14(n, name) .sy_narg = 0, .sy_call = (sy_call_t *)nosys
+#endif
+
 /* The casts are bogus but will do for now. */
 struct sysent freebsd32_sysent[] = {
 	{ .sy_narg = 0, .sy_call = (sy_call_t *)nosys, .sy_auevent = AUE_NULL, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC },	/* 0 = syscall */
@@ -78,7 +84,7 @@
 	{ compat11(AS(freebsd11_mknod_args),mknod), .sy_auevent = AUE_MKNOD, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC },	/* 14 = freebsd11 mknod */
 	{ .sy_narg = AS(chmod_args), .sy_call = (sy_call_t *)sys_chmod, .sy_auevent = AUE_CHMOD, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC },	/* 15 = chmod */
 	{ .sy_narg = AS(chown_args), .sy_call = (sy_call_t *)sys_chown, .sy_auevent = AUE_CHOWN, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC },	/* 16 = chown */
-	{ .sy_narg = AS(break_args), .sy_call = (sy_call_t *)sys_break, .sy_auevent = AUE_NULL, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC },	/* 17 = break */
+	{ compat14(AS(freebsd14_break_args),break), .sy_auevent = AUE_NULL, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC },	/* 17 = freebsd14 break */
 	{ compat4(AS(freebsd4_freebsd32_getfsstat_args),freebsd32_getfsstat), .sy_auevent = AUE_GETFSSTAT, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC },	/* 18 = freebsd4 freebsd32_getfsstat */
 	{ compat(AS(ofreebsd32_lseek_args),freebsd32_lseek), .sy_auevent = AUE_LSEEK, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC },	/* 19 = old freebsd32_lseek */
 	{ .sy_narg = 0, .sy_call = (sy_call_t *)sys_getpid, .sy_auevent = AUE_GETPID, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC },	/* 20 = getpid */
diff --git a/sys/compat/freebsd32/freebsd32_systrace_args.c b/sys/compat/freebsd32/freebsd32_systrace_args.c
--- a/sys/compat/freebsd32/freebsd32_systrace_args.c
+++ b/sys/compat/freebsd32/freebsd32_systrace_args.c
@@ -122,13 +122,6 @@
 		*n_args = 3;
 		break;
 	}
-	/* break */
-	case 17: {
-		struct break_args *p = params;
-		uarg[a++] = (intptr_t)p->nsize; /* char * */
-		*n_args = 1;
-		break;
-	}
 	/* getpid */
 	case 20: {
 		*n_args = 0;
@@ -3553,16 +3546,6 @@
 			break;
 		};
 		break;
-	/* break */
-	case 17:
-		switch (ndx) {
-		case 0:
-			p = "userland char *";
-			break;
-		default:
-			break;
-		};
-		break;
 	/* getpid */
 	case 20:
 		break;
@@ -9201,11 +9184,6 @@
 		if (ndx == 0 || ndx == 1)
 			p = "int";
 		break;
-	/* break */
-	case 17:
-		if (ndx == 0 || ndx == 1)
-			p = "void *";
-		break;
 	/* getpid */
 	case 20:
 	/* mount */
diff --git a/sys/kern/init_sysent.c b/sys/kern/init_sysent.c
--- a/sys/kern/init_sysent.c
+++ b/sys/kern/init_sysent.c
@@ -58,6 +58,12 @@
 #define compat13(n, name) .sy_narg = 0, .sy_call = (sy_call_t *)nosys
 #endif
 
+#ifdef COMPAT_FREEBSD14
+#define compat14(n, name) .sy_narg = n, .sy_call = (sy_call_t *)__CONCAT(freebsd14_, name)
+#else
+#define compat14(n, name) .sy_narg = 0, .sy_call = (sy_call_t *)nosys
+#endif
+
 /* The casts are bogus but will do for now. */
 struct sysent sysent[] = {
 	{ .sy_narg = 0, .sy_call = (sy_call_t *)nosys, .sy_auevent = AUE_NULL, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC },	/* 0 = syscall */
@@ -77,7 +83,7 @@
 	{ compat11(AS(freebsd11_mknod_args),mknod), .sy_auevent = AUE_MKNOD, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC },	/* 14 = freebsd11 mknod */
 	{ .sy_narg = AS(chmod_args), .sy_call = (sy_call_t *)sys_chmod, .sy_auevent = AUE_CHMOD, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC },	/* 15 = chmod */
 	{ .sy_narg = AS(chown_args), .sy_call = (sy_call_t *)sys_chown, .sy_auevent = AUE_CHOWN, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC },	/* 16 = chown */
-	{ .sy_narg = AS(break_args), .sy_call = (sy_call_t *)sys_break, .sy_auevent = AUE_NULL, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC },	/* 17 = break */
+	{ compat14(AS(freebsd14_break_args),break), .sy_auevent = AUE_NULL, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC },	/* 17 = freebsd14 break */
 	{ compat4(AS(freebsd4_getfsstat_args),getfsstat), .sy_auevent = AUE_GETFSSTAT, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC },	/* 18 = freebsd4 getfsstat */
 	{ compat(AS(olseek_args),lseek), .sy_auevent = AUE_LSEEK, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC },	/* 19 = old lseek */
 	{ .sy_narg = 0, .sy_call = (sy_call_t *)sys_getpid, .sy_auevent = AUE_GETPID, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC },	/* 20 = getpid */
diff --git a/sys/kern/syscalls.c b/sys/kern/syscalls.c
--- a/sys/kern/syscalls.c
+++ b/sys/kern/syscalls.c
@@ -22,7 +22,7 @@
 	"compat11.mknod",		/* 14 = freebsd11 mknod */
 	"chmod",			/* 15 = chmod */
 	"chown",			/* 16 = chown */
-	"break",			/* 17 = break */
+	"compat14.break",		/* 17 = freebsd14 break */
 	"compat4.getfsstat",		/* 18 = freebsd4 getfsstat */
 	"compat.lseek",		/* 19 = old lseek */
 	"getpid",			/* 20 = getpid */
diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
--- a/sys/kern/syscalls.master
+++ b/sys/kern/syscalls.master
@@ -213,7 +213,7 @@
 		    int gid
 		);
 	}
-17	AUE_NULL	STD|CAPENABLED {
+17	AUE_NULL	COMPAT14|CAPENABLED {
 		void *break(
 		    _In_ char *nsize
 		);
diff --git a/sys/kern/systrace_args.c b/sys/kern/systrace_args.c
--- a/sys/kern/systrace_args.c
+++ b/sys/kern/systrace_args.c
@@ -119,13 +119,6 @@
 		*n_args = 3;
 		break;
 	}
-	/* break */
-	case 17: {
-		struct break_args *p = params;
-		uarg[a++] = (intptr_t)p->nsize; /* char * */
-		*n_args = 1;
-		break;
-	}
 	/* getpid */
 	case 20: {
 		*n_args = 0;
@@ -3640,16 +3633,6 @@
 			break;
 		};
 		break;
-	/* break */
-	case 17:
-		switch (ndx) {
-		case 0:
-			p = "userland char *";
-			break;
-		default:
-			break;
-		};
-		break;
 	/* getpid */
 	case 20:
 		break;
@@ -9346,11 +9329,6 @@
 		if (ndx == 0 || ndx == 1)
 			p = "int";
 		break;
-	/* break */
-	case 17:
-		if (ndx == 0 || ndx == 1)
-			p = "void *";
-		break;
 	/* getpid */
 	case 20:
 	/* mount */
diff --git a/sys/sys/syscall.h b/sys/sys/syscall.h
--- a/sys/sys/syscall.h
+++ b/sys/sys/syscall.h
@@ -21,7 +21,7 @@
 #define	SYS_freebsd11_mknod	14
 #define	SYS_chmod	15
 #define	SYS_chown	16
-#define	SYS_break	17
+#define	SYS_freebsd14_break	17
 				/* 18 is freebsd4 getfsstat */
 				/* 19 is old lseek */
 #define	SYS_getpid	20
diff --git a/sys/sys/syscall.mk b/sys/sys/syscall.mk
--- a/sys/sys/syscall.mk
+++ b/sys/sys/syscall.mk
@@ -20,7 +20,7 @@
 	freebsd11_mknod.o \
 	chmod.o \
 	chown.o \
-	break.o \
+	freebsd14_break.o \
 	getpid.o \
 	mount.o \
 	unmount.o \
diff --git a/sys/sys/sysproto.h b/sys/sys/sysproto.h
--- a/sys/sys/sysproto.h
+++ b/sys/sys/sysproto.h
@@ -85,9 +85,6 @@
 	char uid_l_[PADL_(int)]; int uid; char uid_r_[PADR_(int)];
 	char gid_l_[PADL_(int)]; int gid; char gid_r_[PADR_(int)];
 };
-struct break_args {
-	char nsize_l_[PADL_(char *)]; char * nsize; char nsize_r_[PADR_(char *)];
-};
 struct getpid_args {
 	syscallarg_t dummy;
 };
@@ -1895,7 +1892,6 @@
 int	sys_fchdir(struct thread *, struct fchdir_args *);
 int	sys_chmod(struct thread *, struct chmod_args *);
 int	sys_chown(struct thread *, struct chown_args *);
-int	sys_break(struct thread *, struct break_args *);
 int	sys_getpid(struct thread *, struct getpid_args *);
 int	sys_mount(struct thread *, struct mount_args *);
 int	sys_unmount(struct thread *, struct unmount_args *);
@@ -2776,6 +2772,10 @@
 
 #ifdef COMPAT_FREEBSD14
 
+struct freebsd14_break_args {
+	char nsize_l_[PADL_(char *)]; char * nsize; char nsize_r_[PADR_(char *)];
+};
+int	freebsd14_break(struct thread *, struct freebsd14_break_args *);
 
 #endif /* COMPAT_FREEBSD14 */
 
@@ -2794,7 +2794,7 @@
 #define	SYS_AUE_freebsd11_mknod	AUE_MKNOD
 #define	SYS_AUE_chmod	AUE_CHMOD
 #define	SYS_AUE_chown	AUE_CHOWN
-#define	SYS_AUE_break	AUE_NULL
+#define	SYS_AUE_freebsd14_break	AUE_NULL
 #define	SYS_AUE_freebsd4_getfsstat	AUE_GETFSSTAT
 #define	SYS_AUE_olseek	AUE_LSEEK
 #define	SYS_AUE_getpid	AUE_GETPID
diff --git a/sys/vm/vm_unix.c b/sys/vm/vm_unix.c
--- a/sys/vm/vm_unix.c
+++ b/sys/vm/vm_unix.c
@@ -59,13 +59,14 @@
 #include <vm/pmap.h>
 #include <vm/vm_map.h>
 
+#ifdef COMPAT_FREEBSD14
 #ifndef _SYS_SYSPROTO_H_
-struct break_args {
+struct freebsd14_break_args {
 	char *nsize;
 };
 #endif
 int
-sys_break(struct thread *td, struct break_args *uap)
+freebsd14_break(struct thread *td, struct freebsd14_break_args *uap)
 {
 #if !defined(__aarch64__) && !defined(__riscv)
 	uintptr_t addr;
@@ -80,6 +81,7 @@
 	return (ENOSYS);
 #endif /* defined(__aarch64__) || defined(__riscv) */
 }
+#endif
 
 int
 kern_break(struct thread *td, uintptr_t *addr)