Cmake cannot find QT6 and I don't know why

Hello so I keep getting this error: g++.exe C:\Users\Vince\Desktop\AppointmentSchedulingSoftware-main\AppointmentSchedulingSoftware-main\main.cpp -o main C:\Users\Vince\Desktop\AppointmentSchedulingSoftware-main\AppointmentSchedulingSoftware-main\main.cpp:2:10: fatal error: QApplication: No such file or directory 2 | #include <QApplication> | ^~~~~~ compilation terminated. And I have no idea why it keeps saying no such file or directory when I have it clearly listed in the CMakeLists.txt file here: cmake_minimum_required(VERSION 3.31) project(AppointmentSchedulingSoftware) set(CMAKE_CXX_STANDARD 17) set(CMAKE_AUTOMOC ON) set(CMAKE_AUTOUIC ON) set(CMAKE_AUTORCC ON) set(CMAKE_AUTOMOC ON) if(UNIX) set(CMAKE_PREFIX_PATH "/usr/lib/x86_64-linux-gnu/cmake") elseif(WIN32) set(CMAKE_PREFIX_PATH "C:/Users/Vince/Documents/QT/6.10.1/mingw_64") endif() find_package(Qt6 REQUIRED COMPONENTS Widgets Sql) add_executable(AppointmentSchedulingSoftware main.cpp MainAppWindow.h) target_link_libraries(AppointmentSchedulingSoftware Qt6::Widgets Qt::Sql) The code I was running was working fine on linux but the moment I switched over to windows it started displaying this message. I do have QT, it's 6.10.1. So what could be the issue that is causing this?