Hi Quentin,
Welcome to the mikroE forum.
You should add these lines to the Project Level Defines file.
To do that properly, please follow these steps:
-Right click on the Project Level Defines from the Project Manager and click on Add New File
-Paste there these two lines as shown in the figure below.
-Include UART and mikroSDK library from the Library Manager
-Do Rebuild All Sources (Alt+F9).
Attachment:
Screenshot_1.png [ 7.71 KiB | Viewed 92 times ]
Also, I do not recommend including all libraries from the Library Manager at the same time.
Some libraries contain the same functions and including them together will cause errors in project compiling.
Kind regards,