qmake -query has wrong output

[g1ennr]

I have installed multiple versions of Qt using the Qt Maintenance tool on Windows 10. I'm trying to run windeployqt for the 5.15.2 mingw8_64 installation and it fails with this error:

Warning: Unable to read \..\mkspecs\qconfig.pri: The system cannot find the path specified.
Unable to find dependent libraries of \..\bin\Qt5Core.dll :Cannot open '/../bin/Qt5Core.dll': The system cannot find the file specified.

I understand that it gets the path information from qmake. For the 5.15.2\mingw81_64 installation qmake -query gives the following output:

QT_SYSROOT:
QT_INSTALL_PREFIX:/..
QT_INSTALL_ARCHDATA:/..
QT_INSTALL_DATA:/..
QT_INSTALL_DOCS:/../doc
...

This is consistent with the error from windeployqt.

For comparison qmake -query for Qt 6.5.3, also installed using the Qt Maintenance tool, gives:

QT_SYSROOT:
QT_INSTALL_PREFIX:C:/Qt/6.5.3/mingw_64
QT_INSTALL_ARCHDATA:C:/Qt/6.5.3/mingw_64
QT_INSTALL_DATA:C:/Qt/6.5.3/mingw_64
QT_INSTALL_DOCS:C:/Qt/Docs/Qt-6.5.3
...

Is there a way to work around this to make windeployqt work for 5.15.2?

[sierdzio]

@g1ennr you can probably use qt.conf to overwrite these paths. Put it in the same dir where qmake is and set Prefix property accordingly.

[g1ennr]

@sierdzio thanks, but that doesn't help.

Also tried calling qmake -unset <var> then qmake -set <var> <val> for each variable. The -unset part doesn't seem to work and it appears that -set prepends to the collection and the previous /.. value is returned anyway, which isn't helpful.

[ChrisW67]

@g1ennr What is actually in your .../Qt/5.15.2/mingw_64/bin/qt.conf?