diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000000..0bae93e4a9
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+./build0.sh
+./build1.sh
diff --git a/examples/expr2.py b/examples/expr2.py
index 2e66f1e584..484873ac2d 100644
--- a/examples/expr2.py
+++ b/examples/expr2.py
@@ -1,10 +1,9 @@
+from lpython import i32
+
 def main0():
     x: i32
     x = (2+3)*5
     print(x)
 
-main0()
-
-# Not implemented yet in LPython:
-#if __name__ == "__main__":
-#    main()
+if __name__ == "__main__":
+   main0()