Installing Qwt-6.0.0-rc1 with Qt Creator 4.7 in Ubuntu 11.04

[minotaurds]

I successfully added QWT in my Windows OS(URL:http://www.qtcentre.org/threads/1930...-Qwt-Qtcreator)

, but the problem is coming in the Linux OS.

When i do qmake, it doesn't give any output in the terminal.(thus error free)
but
when i do make(even after removing the one # as advised in the forum from the .pri file) it gives me the following error

qwt_interval.h:15:20 fatal error: qDebug.h: No such file or directory
compilation terminated
make[1]: *** [obj/qwt_abstract_scale_draw.o] Error 1


and it stops!

PLEASE HELP and considering I am a newbie please give as much detail as possible

THANKS A TON in advance.!