Thank you so much M4Chin3
I spent so much time figuring out how things works regarding QWT,
(my Windows version is Vista 32bits)

I have added
"C:\Qt\Qt5.0.1\5.0.1\mingw47_32\bin"
"C:\Qt\Qt5.0.1\Tools\MinGW\bin"
to user path variable by mistake
then gone through 5 6 7 8 steps

then i noticed my mistake

and added 3 and 4 to system path variable and gone through steps 5 6 7 8 again and completed all the steps


when running at the end compiling process stopped on the #Includes of header files like qwt_plot.h
stating as error report no such file or directory

i added manually the needed Headers to the projects just to go through it but headers refer to other headers and problem is not solve

is it because of the user variable paths ?
what would you recommend to do

Thanks

--
Hamza