LIBSUFFIX AUTO has been a much requested feature for ages.  The Delphi 10.4.1 announcement said:   Sounded interesting so I decided to try that.  I first searched the documentation and found the following: So I added {$LIBSUFFIX AUTO} to a package of mine say xyz.dpk  and the bpl file generated was indeed xyz270.bpl.   However I got an error message saying:   This much for "full support" for this feature.     Am I missing something??