#include<QDialog> file not found or does not exist error occurs how to handle

[C K Senthil kumar]

while compiling i am getting this error file not found or does not exist actually i am opening one old project in my Qt version 5.5 how to solve this issue plz help

[SGaist]

Hi and welcome to devnet,

Any chances that you are missing QT += widgets in your .pro file ?

[Ratzz]

@C-K-Senthil-kumar
Do you have greaterThan(QT_MAJOR_VERSION, 4): QT += widgets in your pro file?