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diff --git a/vendor/modernc.org/mathutil/Makefile b/vendor/modernc.org/mathutil/Makefile
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+# Copyright (c) 2016 The mathutil Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+.PHONY:	all clean cover cpu editor internalError later mem nuke todo edit
+
+grep=--include=*.go --include=*.l --include=*.y --include=*.yy
+ngrep='TODOOK\|parser\.go\|scanner\.go\|.*_string\.go'
+
+all: editor
+	go vet 2>&1 | grep -v $(ngrep) || true
+	golint 2>&1 | grep -v $(ngrep) || true
+	make todo
+	misspell *.go
+	unconvert || true
+	maligned || true
+	staticcheck || true
+
+clean:
+	go clean
+	rm -f *~ *.test *.out
+
+cover:
+	t=$(shell tempfile) ; go test -coverprofile $$t && go tool cover -html $$t && unlink $$t
+
+cpu: clean
+	go test -run @ -bench . -cpuprofile cpu.out
+	go tool pprof -lines *.test cpu.out
+
+edit:
+	@ 1>/dev/null 2>/dev/null gvim -p Makefile *.go &
+
+editor:
+	gofmt -l -s -w *.go
+	go test
+	go build
+
+internalError:
+	egrep -ho '"internal error.*"' *.go | sort | cat -n
+
+later:
+	@grep -n $(grep) LATER * || true
+	@grep -n $(grep) MAYBE * || true
+
+mem: clean
+	go test -run @ -bench . -memprofile mem.out -memprofilerate 1 -timeout 24h
+	go tool pprof -lines -web -alloc_space *.test mem.out
+
+nuke: clean
+	go clean -i
+
+todo:
+	@grep -nr $(grep) ^[[:space:]]*_[[:space:]]*=[[:space:]][[:alpha:]][[:alnum:]]* * | grep -v $(ngrep) || true
+	@grep -nr $(grep) TODO * | grep -v $(ngrep) || true
+	@grep -nr $(grep) BUG * | grep -v $(ngrep) || true
+	@grep -nr $(grep) [^[:alpha:]]println * | grep -v $(ngrep) || true