<p>Looks as Alpine not use <code>glibc</code> and used <a href="https://pkgs.alpinelinux.org/package/edge/main/x86/musl" rel="nofollow"><code>musl 1.1.23-r3</code></a> library (<a href="http://www.musl-libc.org/releases/musl-1.1.23.tar.gz" rel="nofollow">sources</a>)</p>
<p>I tried search about usage <code>#ifdef __MUSL__</code> and found this <a href="https://www.openwall.com/lists/musl/2013/03/29/13" rel="nofollow">response</a>.</p>
<p>I also looked into <code>musl</code> sources and <code>musl-dev</code> package and not found <code>GLIBC</code> comparability macros.</p>

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