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Makefile

@@ -50,7 +50,7 @@ doc/demo.svg: fq
 .PHONY: doc/formats.svg
 doc/formats.svg: fq
 # ignore graphviz version as it causes diff when nothing has changed
-	./fq -rnf doc/formats_diagram.jq | dot -Tsvg | grep -v 'Generated by graphviz version' > doc/formats.svg
+	./fq -rnf doc/formats_diagram.jq | dot -Tsvg | sed 's/Generated by graphviz.*//' > doc/formats.svg
 
 doc/file.mp3: Makefile
 	ffmpeg -y -f lavfi -i sine -f lavfi -i testsrc -map 0:0 -map 1:0 -t 20ms "$@"