I used ltrace and saw a call to getenv(&quot;SDKROOT&quot;) but pointing it to any of:<p>export SDKROOT=$HOME&#x2F;swift&#x2F;usr<p>or<p>export SDKROOT=$HOME&#x2F;swift&#x2F;usr&#x2F;lib<p>or<p>export SDKROOT=$HOME&#x2F;swift&#x2F;usr&#x2F;lib&#x2F;swift<p>All the above do not work, maybe when github is up we can see how to do it.