Incorrect Makefile generated

[Octal]

sure, really simple :

QT       += core gui
 
TARGET = qmaketest
TEMPLATE = app
 
CONFIG -= debug_and_release
CONFIG *= qt warn_on release
 
 
SOURCES += main.cpp\
        mainwindow.cpp
 
HEADERS  += mainwindow.h
 
FORMS    += mainwindow.ui

QT       += core gui

TARGET = qmaketest
TEMPLATE = app

CONFIG -= debug_and_release
CONFIG *= qt warn_on release


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

To copy to clipboard, switch view to plain text mode 

just a basic .pro generated by Qt Creator in which I added the two CONFIG lines. Removing or commenting the first CONFIG line makes the application compile. Otherwise, I get :

process_begin: CreateProcess(NULL, c:\Qt\Desktop\Qt\4.7.2\mingw\binuic.exe ..\qmaketest\mainwindow.ui -o ui_mainwindow.h, ...) failed.

where a '\' is missing. I really don't get it :/