I'm using Delphi XE4 with the latest code for vcl-styles-utils at https://github.com/RRUZ/vcl-styles-utils. I can not compile my app and getting the following error:
[dcc32 Fatal Error] Vcl.Styles.Utils.ScreenTips.pas(57): F1026 File not found: 'Vcl.SysStyles.dcu'
I can not find this unit anywhere. Where can I find the Delphi unit Vcl.SysStyles ?
Your diagnosis of the problem is incorrect. This is VCL unit which is supplied by Embarcadero with Delphi. This particular unit was added to the VCL after XE4, in 10.0 Seattle.
Therefore the problem is that vcl-styles-utils needs to include conditional code to suppress references to this unit for Delphi versions which pre-date its addition.
This issue has been fixed by a recent commit.