--- boost_1_78_0/tools/build/src/engine/build.sh.orig
+++ boost_1_78_0/tools/build/src/engine/build.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 #~ Copyright 2002-2020 Rene Rivera.
 #~ Distributed under the Boost Software License, Version 1.0.