Error when building Qt5.13.2 from source on Windows for Android.

[advm]

Hello,

I have a problem while trying to build Qt 5.13.2 from source for Android.
I have used PowerShell on Windows 10.
Before configure command I have set JDK_ROOT path:

set "JDK_ROOT=C:\Program Files\Java\jdk1.8.0_241\bin

This configure command is executed successfully:

..\src\qt5\configure -prefix E:\Qt\Static\Qt5.13.2Android -platform win32-g++ -opengl es2 -xplatform android-clang -android-sdk C:\Users\user\AppData\Local\Android\Sdk -android-ndk C:\Users\user\AppData\Local\Android\Sdk\ndk\21.3.6528147 -nomake tests -nomake examples -opensource -confirm-license -static -release

I am getting 2 warnings after configure command:

WARNING: Python version 2 (2.7.5 or later) is required to build QtWebEngine.
WARNING: host pkg-config not found

After this I execute:

mingw32-make -j4

and shortly after start the build stops with this output at the end:

del ..\..\..\lib\libQt5Bootstrap.a 2>NUL
ar -rc ..\..\..\lib\libQt5Bootstrap.a @object_script.libQt5Bootstrap.Release
mingw32-make[4]: Leaving directory 'E:/Qt/Static/build-android/qtbase/src/tools/bootstrap'
mingw32-make[3]: Leaving directory 'E:/Qt/Static/build-android/qtbase/src/tools/bootstrap'
mingw32-make[2]: Leaving directory 'E:/Qt/Static/build-android/qtbase/src'
mingw32-make[1]: *** [Makefile:51: sub-src-make_first] Error 2
mingw32-make[1]: Leaving directory 'E:/Qt/Static/build-android/qtbase'
mingw32-make: *** [Makefile:87: module-qtbase-make_first] Error 2

Any suggestion or idea why build stops? Thanks in advance.

UPDATE: Same happens with Qt 5.14.2 and Qt 5.12.5

[advm]

Found what was causing the problem from here.

I don't know why but running without -j4 like this:

mingw32-make

there is no error and qt is built successfully. I thought that without -j4 I would see the error message but luckily there was no error.