How to install qwt with qt4 on RHEL 6?

[sumit11]

I have installed Qt 4.7.0(64 bit) on red hat 6 and it is working also.But in my project I also need qwt ,so I installed qwt 5.2.1 , I see header files Qwt_double_interval.h,
Qwt_color_map.h which I included in my project but while compiling it is showing an error :
undefined reference to QwtLinearColormap
Am I going wrong with installation of Qwt or where I am going wrong?

[mcosta]

have you correctly linked Qwt?
can you post your project file?

[SixDegrees]

The compiler is finding the header files. An undefined reference indicates that the linker can't find the Qwt libraries. You'll need to add something like

LIBS += -L /path/to/qwt/installation -lqwt

LIBS += -L /path/to/qwt/installation -lqwt

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to your project file.