D47258.diff
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	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}'. No arguments permitted
	+. endif
	+.endif