Qt 5.10.0 won't configure under Linux and complains about unknown feature object printing-and-pdf

Starting with a clean fetch of Qt (5.10.0 beta 4? Not entirely sure) from git://code.qt.io/qt/qt5.git with Git branch "5.10" (downloaded into ~/dev/qt_local_build/src/qt5/ for this example), the following command fails:

~/dev/qt_local_build/src/qt5/configure -prefix ~/dev/qt_local_build/qttmp_install -opensource -confirm-license

with this error:

Running configuration tests...

...
Project ERROR: Unknown feature object printing-and-pdf in expression 'config.unix && features.printing-and-pdf'.

The only file that appears to have that phrase in is qtwebengine/configure.json, in this bit:

     "webengine-system-lcms2" : {
        "label": "lcms2",
        "autoDetect": "libs.webengine-lcms2",
         "condition": "config.unix && features.printing-and-pdf",
         "output": [ "privateFeature" ]
     },

Should that say "features.webengine-printing-and-pdf"? That would then match

configure -list-features

Manually making that change allows the configure command to complete.