I found a .pro file 5.12.1\Src\qtbase\src\plugins\platforms\windows\windows.pro and opened it in Qt Creator. After configuring a MingW kit, I tried to build the project. But I got this error;
error: vulkan/vulkan.h: No such file or directory
#include <vulkan/vulkan.h>
Do I need to configure something before building the project? I do not want the vulkan support, just want to compile it successfully. I remember if I build the whole Qt src, I need to run a command like "configure xxxxx" in the src directory. Now I do not want to build whole Qt, just this project. There is a line in windows.pro that seems related to this problem.
qtConfig(vulkan): QT += vulkan_support-private
How should I do to remove the need for the vulkan stuff in order to build it successfully?
Yes, you will need to configure things. I suggest you read up on Building Qt 5 from source to understand what is involved.