Sailfish SDK has got its new monthly update for January, posted by Jarko Vihriälä
The changelog would be: (I prefer to quote the whole message here)
Hello again, Today at 16:00 UTC we are publishing a little update on SailfishOS SDK. The update itself touches only the Build Engine. What you need to do is to boot up the Build Engine after the updates have been published (i.e. click the sdk icon in Qt Creator) and wait 10 minutes while it refreshes its repositories. Then access the SDK Control Center Updates view and you should see that Engine updates are available. Release note: - SDK Control Center * - Download and reinstall build targets (i.e.) sysroots. This is done using the new pull-down menu called 'Pre-configured targets' in 'Targets' view of Control Center. * - Provide a tool to verify that basic submission criterias are fulfilled with Harbour intake requirements. This is done from the new view called 'Harbour Tools' in Control Center. If you have any questions, you can either send email to this mailing list: devel at lists.sailfishos.org or write it up on together.jolla.com and tag your issue with 'sdk'. Happy hacking, Jolla SDK Team.
You can download the SDK for Linux, Windows and Mac down below:
Have fun hacking!!
Source: Sailfish Devel Mailing List