Build failure with:
Unexpected error parsing /var/tmp/portage/dev-qt/qtwebkit-5.212.0_pre20200309-r1/work/qtwebkit-5.212.0-alpha4/Source/JavaScriptCore/bytecode/BytecodeList.json: (<class 'TypeError'>, TypeError("_init_() got an unexpected keyword argument 'encoding'"), <traceback object at 0x7fbf2e126480>)
Please integrate the patch in https://bugs.gentoo.org/766303
Thank you!