QT 5.15 breaks VirtualBox (6.1.8)

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Some Qt header files have changed in 5.15 and on my Gentoo box I am no longer able to compile VirtualBox (tested only with 6.1.8, others might break also). The issue is a complaint about QPâinterPath. E.g.:

kBuild: Compiling UICommon - /tmp/VirtualBox-6.1.8/src/VBox/Frontends/VirtualBox/src/globals/UIImageTools.cpp
/tmp/VirtualBox-6.1.8/src/VBox/Frontends/VirtualBox/src/globals/UIImageTools.cpp: In function ‘QImage betaLabelImage(const QSize&)’:
/tmp/VirtualBox-6.1.8/src/VBox/Frontends/VirtualBox/src/globals/UIImageTools.cpp:225:18: error: aggregate ‘QPainterPath tp’ has incomplete type and cannot be defined
  225 |     QPainterPath tp;
      |                  ^~
/tmp/VirtualBox-6.1.8/src/VBox/Frontends/VirtualBox/src/globals/UIImageTools.cpp:231:5: error: ‘QPainterPathStroker’ was not declared in this scope; did you mean ‘QPainterPath’?
  231 |     QPainterPathStroker pps;
      |     ^~~~~~~~~~~~~~~~~~~
      |     QPainterPath
/tmp/VirtualBox-6.1.8/src/VBox/Frontends/VirtualBox/src/globals/UIImageTools.cpp:232:18: error: variable ‘QPainterPath pp’ has initializer but incomplete type
  232 |     QPainterPath pp = pps.createStroke(tp);
      |                  ^~
/tmp/VirtualBox-6.1.8/src/VBox/Frontends/VirtualBox/src/globals/UIImageTools.cpp:232:23: error: ‘pps’ was not declared in this scope
  232 |     QPainterPath pp = pps.createStroke(tp);
      |                       ^~~
kmk: *** [/tmp/VirtualBox-6.1.8/kBuild/footer-pass2-compiling-targets.kmk:277: /tmp/VirtualBox-6.1.8/out/linux.amd64/release/obj/UICommon/src/globals/UIImageTools.o] Error 1
kmk: *** Waiting for unfinished jobs....

[Frank Batschulat (Oracle)]

What is "your Gentoo" box? Kernel version, distribution version please. /etc/os-release

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With this patch the build completes sucessfully

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Replying to fbatschu:

What is "your Gentoo" box? Kernel version, distribution version please. /etc/os-release

# cat /etc/os-release NAME=Gentoo ID=gentoo PRETTY_NAME="Gentoo/Linux" ANSI_COLOR="1;32" HOME_URL="​https://www.gentoo.org/" SUPPORT_URL="​https://www.gentoo.org/support/" BUG_REPORT_URL="​https://bugs.gentoo.org/"

Kernel is 5.6.15 Arch is x86/64