title: Recipe for target '.build-impl' failed
body: <p>I'm trying to reproduce the library example provided by Netbeans. In other words, I made an exact copy of this library, but instead using Netbeans samples I created files myself. </p>
  
  <p>Here's what I mean (<code>hello4lib</code> is from samples, <code>myLib</code> is manually created)</p>
  
  <p><a href="https://i.stack.imgur.com/Ndo1c.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ndo1c.png" alt="enter image description here"></a></p>
  
  <p>The problem is that <code>myLib</code> build fails, but <code>hello4lib</code> doesn't. It doesn't make any sense, because they are the same (makefiles are identical too). What am I missing?</p>