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> grep: /etc/rpm: No such file or directory
> grep: /usr/lib/rpm: No such file or directory

errors.

Bug: https://bugs.gentoo.org/656446

--- keyutils-1.6.1/Makefile
+++ keyutils-1.6.1/Makefile
@@ -267,7 +267,7 @@
 ZSRCBALL := rpmbuild/SOURCES/$(ZTARBALL)
 
 BUILDID	:= .local
-dist	:= $(word 2,$(shell grep -r "^%dist" /etc/rpm /usr/lib/rpm))
+dist	:= $(word 2,$(shell grep -r "^%dist" /etc/rpm /usr/lib/rpm 2>/dev/null))
 release3:= $(word 2,$(shell grep ^Release: $(SPECFILE)))
 release2:= $(subst %{?dist},$(dist),$(release3))
 release1:= $(subst %{?buildid},$(BUILDID),$(release2))