pyqtdeploy-demo: build-demo does not run qmake correctly

[Frans Fürst]

I'm afraid I stumbled upon another difficutly building the demo for Android:

Environment: Debian 10 or Fedora 33, pyqtdeploy 3.1.0, Qt5.15.2 and

Qt5.15.0, Qt built from source for Android, Modifications: decativated openssl for Android in sysroot.toml

command:
PATH="$HOME/demo/qt5-android/build/bin:$PATH" \
ANDROID_SDK_ROOT=~/android-sdk/ \
ANDROID_NDK_PLATFORM=android-29 \
ANDROID_NDK_ROOT=~/android-sdk/ndk/21.3.6528147/ \
python3 ./build-demo.py --target android --verbose

... lots of compiling
make[1]: Leaving directory '/tmp/tmp5v9781zl/Qsci'
The project has been installed.
Deleting /home/frans/pyqtdeploy/demo/sysroot-android-32/build.
Verifying host architecture 'linux-64'...
Verifying target architecture 'android-32'...
Verifying Python v3.7.8...
Verifying PyQt v5.15.2...
Verifying PyQt3D v5.15.2...
Verifying PyQtChart v5.15.2...
Verifying PyQtDataVisualization v5.15.2...
Verifying PyQtPurchasing v5.15.2...
Verifying QScintilla v2.11.5...
Verifying Qt v5.15.2...
Running '/home/frans/demo/qt5-android/build/bin/qmake -query'.
Verifying SIP v12.8.1...
Verifying zlib v1.2.7...
zlib: determining installed version from '/home/frans/android-sdk/ndk/21.3.6528147/sysroot/usr/include/zlib.h'.
Cleaning /home/frans/pyqtdeploy/demo/build-android.
Creating /home/frans/pyqtdeploy/demo/build-android.
Running '/home/frans/pyqtdeploy/demo/sysroot-android-32/host/bin/python3.7 -OO /usr/local/lib/python3.7/dist-packages/pyqtdeploy/builder/lib/freeze.py /tmp/tmppevn_afr/jobs.csv'.
Freezing bootstrap-3.7.0.py...
... lots of freezing
Freezing opcode...
Traceback (most recent call last):
File "./build-demo.py", line 153, in <module>
run([qmake_path])
File "./build-demo.py", line 38, in run
ec = subprocess.call(' '.join(args), shell=True)
TypeError: sequence item 0: expected str instance, NoneType found

Looking into the code it's obvious that qmake binary has not been identified correctly and thus it should be an easy to solve problem. But since I'm not aware of any changes to the "standard" environment and this demo should have been working for at least someone, I'd like to know what's going wrong here.

Any clues?
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