How to install qwt with qt4 on RHEL 6?

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?

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

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

Code:

---

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

---

to your project file.