I want to call the make command from a bash script in a MinGW bash shell. However the script seems to know "make" only when I call the script using source:

build.sh:

#!/bin/bash
make all

Calling source build.sh from the terminal works: The target all is built.

Calling only build.sh from the terminal results in

./build.sh: line 2: make: command not found

Why do I have to source the script to have a working make command?