Environment variables in project .includes?

[Karmaflute]

That doesn't work either. This is what I tried:

$$(CC_VC2010)/VC/atlmfc/include

$$(CC_VC2010)/VC/atlmfc/include

To copy to clipboard, switch view to plain text mode 

[rknowles]

I added this to my .pro file:

message(QTDIR %QTDIR% $QTDIR $$(QTDIR))

message(QTDIR %QTDIR% $QTDIR $$(QTDIR))

To copy to clipboard, switch view to plain text mode 

which resulted in this output:

Project MESSAGE: QTDIR %QTDIR% $QTDIR C:/Qt/2009.03/qt

Project MESSAGE: QTDIR %QTDIR% $QTDIR C:/Qt/2009.03/qt

To copy to clipboard, switch view to plain text mode 

This shows $$(var) worked for me. Maybe I misunderstood what you mean by ".includes file".

[Karmaflute]

I don't know if it's different from a normal project. I have a file that was created with my makefile import project that is (projectname).includes which allows QT Creator to find directories used for code completion and syntax checking.