How to write a correct .pri file ? Qtcreator does not include my sources ....

I have the next .pri file :

Code:

---

INCLUDEPATH += D:/MY_path/MY_folder 
 
SOURCES +=  file1.cpp \
    file2.cpp \
    file3.cpp
 
HEADERS +=    file1.h \    
    file2.h \
    file3.h

---

Ok, I want to add this file to some projects, which are located at several paths in my C or D drive (So I cannot write ../path/path .... to define relative paths or simply I dont want )

I use at the .pro file where I want to have the 'my_project' files :

Code:

---

include(d:/MY_path/MY_folder/my_project.pri)

---

In the example I show, QtCreator detects only headers....
(I see the .folder with the .pri file and the Headers folder, but not the Sources folder).

Any help ? Thanks

Solved....
You must use absolute paths .....