While trying to build the spellchecker example with Qt 5.9 beta 3 on macOS, it fails with the following log:
18:20:32: Starting: "/usr/bin/make"
/Volumes/T3/Dev/qt/official_qt590_beta3/5.9/clang_64/bin/qwebengine_convert_dict ../spellchecker/dict/en/en-US.dic qtwebengine_dictionaries/en-US.bdic
Couldn't find ICU data directory. Please check that the following path exists: /Volumes/T3/Dev/qt/official_qt590_beta3/Examples/Qt-5.9/webenginewidgets/resources
Alternatively provide the directory path via the QT_WEBENGINE_ICU_DAT_DIR environment variable.
make: *** [qtwebengine_dictionaries/en-US.bdic] Error 1
It works fine for me with custom Qt 5.9 build which is a non-prefix build.
It might be a resurgence of https://bugreports.qt.io/browse/QTBUG-58451