diff --git a/Mk/Uses/sbrk.mk b/Mk/Uses/sbrk.mk
new file mode 100644
--- /dev/null
+++ b/Mk/Uses/sbrk.mk
@@ -0,0 +1,21 @@
+# handle ports requring sbrk
+#
+# Feature:	sbrk
+# Usage:	USES=sbrk
+# Valid ARGS:	<none>
+#
+# Software requiring the sbrk pseudo-syscall is broken on aarch64 and
+# riscv64.  Mark it as such.
+#
+# MAINTAINER:	brooks@FreeBSD.org
+
+.if !defined(_INCLUDE_USES_SBRK_MK)
+_INCLUDE_USES_SBRK_MK=	yes
+
+.  if empty(sbrk_ARGS)
+BROKEN_aarch64=	requires sbrk
+BROKEN_riscv64=	requires sbrk
+.  else
+IGNORE=	Incorrect 'USES+=sbrk:${sbrk_ARGS}'
+.  endif
+.endif