&gt; or even smaller projects like glibc.<p>Umm, &quot;smaller&quot;<p>&gt; incrementally rewrite<p>It is <i></i>GNU<i></i> LibC, even if your rewrite is GPLv1337, the toolchain isn&#x27;t &quot;free enough&quot; for them. You will be &quot;stopped by verbal force&quot; in the sake of preserving an inferior, but &quot;free&quot; core library.