Unsolved Failed to build Qt 6.1.2 from source.

[jiapei1000]

Failed to build Qt 6.1.2 from source.
My ENV:

➜  ~ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.2 LTS
Release:	20.04
Codename:	focal
➜  ~ gcc --version
gcc (GCC) 10.3.1 20210627
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Error messages:

......
Configuring 'qt3d'
 Could NOT find Qt6Gamepad (missing: Qt6Gamepad_DIR)
 Using source syncqt found at: ....../qt-everywhere-src-6.1.2/qtbase/libexec/syncqt.pl
 Running syncqt for module: 'Qt3DCore'
 CMake Warning (dev) at /usr/lib/x86_64-linux-gnu/cmake/assimp-5.0/assimpTargets.cmake:54 (if):
   if given arguments:

     "ON"

   An argument named "ON" appears in a conditional statement.  Policy CMP0012
   is not set: if() recognizes numbers and boolean constants.  Run "cmake
   --help-policy CMP0012" for policy details.  Use the cmake_policy command to
   set the policy and suppress this warning.
 Call Stack (most recent call first):
   /usr/lib/x86_64-linux-gnu/cmake/assimp-5.0/assimp-config.cmake:1 (include)
   qt3d/cmake/FindWrapQt3DAssimp.cmake:8 (find_package)
   qtbase/cmake/QtFindPackageHelpers.cmake:113 (find_package)
   qt3d/src/core/configure.cmake:13 (qt_find_package)
   qtbase/cmake/QtModuleHelpers.cmake:415 (include)
   qt3d/src/core/CMakeLists.txt:7 (qt_internal_add_module)
 This warning is for project developers.  Use -Wno-dev to suppress it.
 Performing Test
 CMake Warning (dev) at /usr/lib/x86_64-linux-gnu/cmake/assimp-5.0/assimpTargets.cmake:54 (if):
   if given arguments:

     "ON"

   An argument named "ON" appears in a conditional statement.  Policy CMP0012
   is not set: if() recognizes numbers and boolean constants.  Run "cmake
   --help-policy CMP0012" for policy details.  Use the cmake_policy command to
   set the policy and suppress this warning.
 Call Stack (most recent call first):
   /usr/lib/x86_64-linux-gnu/cmake/assimp-5.0/assimp-config.cmake:1 (include)
   ....../qt-everywhere-src-6.1.2/qt3d/cmake/FindWrapQt3DAssimp.cmake:8 (find_package)
   ....../qt-everywhere-src-6.1.2/qt3d/config.tests/assimp/CMakeLists.txt:7 (find_package)
 This warning is for project developers.  Use -Wno-dev to suppress it.
 CMake Error in ....../qt-everywhere-src-6.1.2/qt3d/config.tests/assimp/CMakeLists.txt:
   Imported target "WrapQt3DAssimp::WrapQt3DAssimp" includes non-existent path

     "/usr/lib/include"

   in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

   * The path was deleted, renamed, or moved to another location.

   * An install or uninstall procedure did not complete successfully.

   * The installation package was faulty and references files it does not
   provide.


 CMake Error in ....../qt-everywhere-src-6.1.2/qt3d/config.tests/assimp/CMakeLists.txt:
   Imported target "WrapQt3DAssimp::WrapQt3DAssimp" includes non-existent path

     "/usr/lib/include"

   in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

   * The path was deleted, renamed, or moved to another location.
   * An install or uninstall procedure did not complete successfully.

   * The installation package was faulty and references files it does not
   provide.


 CMake Error at qtbase/cmake/QtFeature.cmake:802 (try_compile):
   Failed to generate test project build system.
 Call Stack (most recent call first):
   qt3d/src/core/configure.cmake:15 (qt_config_compile_test)
   qtbase/cmake/QtModuleHelpers.cmake:415 (include)
   qt3d/src/core/CMakeLists.txt:7 (qt_internal_add_module)

 Configuring incomplete, errors occurred!
 See also "....../qt-everywhere-src-6.1.2/build/CMakeFiles/CMakeOutput.log".
 See also "....../qt-everywhere-src-6.1.2/build/CMakeFiles/CMakeError.log".

[VRonin]

Can you post your configure invocation?