qwt on MacOS QtCreator

Hello.I have installed the qwt libraries but i don't know how to use them in my qt Creator.I write this on my .pro file but it shows me the following error:

Code:

---

INCLUDEPATH+=/usr/local/qwt-5.2/lib
 
LIBS += -lqwt

---

error

Code:

---

error: collect2: ld returned 1 exit status

---

can anyone tell me what do i have to write?All the files are on this path:/usr/loca/qwt-5.2/lib!
Thanks in advance.

Open the terminal and type export DYLD_LIBRARY_PATH=/usr/local/qwt-5.2/lib
and then open the qt creator in the terminal or run the application from the terminal .