How to fix Alpine Linux fatal error: stdio.h: No such file or directory

Problem:

When trying to compile a C/C++ program or library on Alpine Linux, you see an error message like

example.txt

/home/user/test.cpp:5:10: fatal error: stdio.h: No such file or directory
  123 | #include <stdio.h>
      |          ^~~~~~~~~

/home/user/test.cpp:5:10: fatal error: stdio.h: No such file or directory
  123 | #include <stdio.h>
      |          ^~~~~~~~~

Install the libc headers using

example.sh

apk add musl-dev

apk add musl-dev

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