https://bugs.gentoo.org/686652

--- LVM2.2.02.184/tools/Makefile.in
+++ LVM2.2.02.184/tools/Makefile.in
@@ -220,6 +220,6 @@
 	  echo "/* Do not edit. This file is generated by the Makefile. */" && \
 	  echo -en "const char _command_input[] =\n\n\"" && \
 	  $(EGREP) -v '^#|\-\-\-|^$$' $(srcdir)/command-lines.in | $(AWK) 'BEGIN {ORS = "\\n\"\n\""} //' && \
-	  echo "\\n\";" \
+	  printf "%s\n" "\\n\";" \
 	) > $@
 
 $(SOURCES:%.c=%.d) $(SOURCES2:%.c=%.d): command-lines-input.h command-count.h cmds.h