build: make 'run' target invoke the built binary

ober

b30d10b39efc3adc7dac88f15160900b79bc8336

diff --git a/Makefile b/Makefile
index 91112e4..432df36 100644
--- a/Makefile
+++ b/Makefile
@@ -20,9 +20,9 @@ binary:
 
 build: binary
 
-# Run from source without building the binary.
-run:
-	$(JERBUILD) exec $(LIBDIRS) main.ss
+# Build then run the binary (e.g. make run ARGS="s/a/b/").
+run: binary
+	./$(JSED_BIN) $(ARGS)
 
 clean:
 	find lib \( -name '*.so' -o -name '*.wpo' \) -delete 2>/dev/null || true