diff --git a/Makefile b/Makefile
index 77ef381..33093fa 100644
--- a/Makefile
+++ b/Makefile
@@ -2,13 +2,16 @@ CFLAGS=-Iduktape -fPIC -O3 -march=native -W
 LDLIBS=-lm
 LDFLAGS=-shared
 
-all: jseval.so
+all: jseval.so escodegen_setup
 
 jseval.so: jseval.o duktape/duktape.o
 	$(CC) -o $@ $^ $(LDFLAGS) $(LDLIBS)
 
 jseval.o: jseval.c duktape/duktape.h duktape/duk_config.h
 
+escodegen_setup:
+	npm install escodegen
+
 clean:
 	rm -f *~ jseval.so *.o duktape/*.o
 
diff --git a/do.sh b/do.sh
index 93b3da7..b4e3ac4 100755
--- a/do.sh
+++ b/do.sh
@@ -1,7 +1,9 @@
 #!/bin/bash
+ROOT_DIR="$(cd "$(dirname "$0")" && pwd -P)"
+
 NAME="$1"
 shift
-./analyze.py $NAME.js $NAME.pck
-./transform.py $* $NAME.pck $NAME.json
-node --stack-size=1000000 ./prettyprint.js $NAME.json $NAME-out.js
+$ROOT_DIR/analyze.py $NAME.js $NAME.pck
+$ROOT_DIR/transform.py $* $NAME.pck $NAME.json
+node --stack-size=1000000 $ROOT_DIR/prettyprint.js $NAME.json $NAME-out.js