Makefile Error 3

Question

Related Problem

I have compiled OpenV 3.1 with Qt Creator 3.6.0 32bits in Win10 machine.

While building a sample OpenCV program it gives me [Makefile]Error 3 with these details:

10:02:32: Running steps for project Sanj...
10:02:32: Configuration unchanged, skipping qmake step.
10:02:32: Starting: "C:\Qt\Tools\mingw492_32\bin\mingw32-make.exe" 
C:\Qt\5.5\mingw492_32\bin\qmake.exe -spec win32-g++ "CONFIG+=debug" "CONFIG+=qml_debug" -o Makefile ..\Sanj\Sanj.pro
makefile:195: recipe for target 'Makefile' failed
C:/Users/Samir Chohg/Desktop/Sanj/Sanj.pro:27: Extra characters after test expression.
Error processing project file: ..\Sanj\Sanj.pro
mingw32-make: *** [Makefile] Error 3
10:02:32: The process "C:\Qt\Tools\mingw492_32\bin\mingw32-make.exe" exited with code 2.
Error while building/deploying project Sanj (kit: Desktop Qt 5.5.1 MinGW 32bit)
When executing step "Make"

The code is:

QT       += core
QT       -= gui

TARGET = Un
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

INCLUDEPATH += C:/opencv/qttest/install/include

LIBS += -LC:/opencv/qttest/install/x86/mingw/bin
    -lopencv_core310 \
    -lopencv_highgui310 \
    -lopencv_imgproc310 \
    -lopencv_features2d310 \
    -lopencv_calib3d310

Can someone show me where the problem is? Thanks in advance.

Answer 1

You are missing the line continuation character on the LIBS += line.

Change

LIBS += -LC:/opencv/qttest/install/x86/mingw/bin -lopencv_core310 \\ -lopencv_highgui310 \\ -lopencv_imgproc310 \\ -lopencv_features2d310 \\ -lopencv_calib3d310

to
LIBS += -LC:/opencv/qttest/install/x86/mingw/bin \\ -lopencv_core310 \\ -lopencv_highgui310 \\ -lopencv_imgproc310 \\ -lopencv_features2d310 \\ -lopencv_calib3d310