The second failure ninja: build stopped: subcommand failed. is a direct successor of the first error. Fix the first error, and the second will disappear. the file does exist and is in the include directory Can you tell us the path to this directory? According to the compiler command line, your compiler searches in the following directories: -I/Users/jamesmartin/sourceCode/C++/qt/QTCurvesCPP2/build/Desktop_arm_darwin_generic_mach_o_64bit-Debug/QTCurvesCPP2_autogen/include -isystem /Applications/qt/6.7.2/macos/lib/QtCore.framework/Headers -iframework /Applications/qt/6.7.2/macos/lib -isystem /Applications/qt/6.7.2/macos/mkspecs/macx-clang -isystem /Applications/qt/6.7.2/macos/include -isystem /Applications/qt/6.7.2/macos/lib/QtWidgets.framework/Headers -isystem /Applications/qt/6.7.2/macos/lib/QtGui.framework/Headers which seems a bit strange to me as it does not have any source directory in the list. Can you show your CMakeLists.txt?

@rahmanih said in Can't build QT6 on Windows using MingWin54: Git BASH to run the build command. You must not have any MSYS related stuff in your PATH - otherwise the build tools might pick them up (due to same name) and it will fail. You can see the problem already in your first output if I'm correct: "@C:/temp/qt6_min/qtbase/src/3rdparty/libjpeg/JpegPrivate_syncqt_args" - the forward slashes (but I might be wrong)

@franzhelmut this process works on my Windows10 PC, with the 2015 compiler. On Windows11 I cannot install the 2015 compiler. The 2019 compiler seems to need more resources like heap space.

@san_qt_enthusisast I guess you should be using Java 8

@J-Hilk Thanks for your help! It works!

@lorn-potter Thanks for getting back to me! I'm trying to build this project: https://github.com/herewegoblueno/cs1230-final Just to provide context, this works well when built for Mac. And yes I am importing GL/glew.h myself. Also by the way I've also noticed that the compilers don't recognize the standard libraries like <vector>, <map>, etc (or maybe that's just the static checker? not sure if those will result in compile time errors since I can't build due to glew anyways)

@Davronito Yes many times.........

@ru10 said in Build fails as ui_mainwindow.h not found: "How to fix ui_mainwindow.h file not found"? @jsulm said in Build fails as ui_mainwindow.h not found: "And also getting ui_mainwindow.h not found" - this file is generated when you build your project Have you tried building your project? You will get these messages until you do.....