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Michael Pyne authored
The qtdir setting took on much less importance with Qt 5. We've never officially supported building Qt 5 with kdesrc-build, and qmake and cmake both use qmake or similar Qt-provided config information to find Qt, rather than using the unsupported QTDIR environment variable. As a result, default the value to an empty string (interpreted as use of system Qt) and stop adding it automatically to the environment variables defined during the build. If set, it will continue to be used for now. This also helps the environment setup driver detect when it should look for the system Qt5 qmake.
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