diff -Nru kalgebra-21.08.0/debian/changelog kalgebra-21.08.0/debian/changelog
--- kalgebra-21.08.0/debian/changelog	2021-08-16 06:47:12.000000000 +0000
+++ kalgebra-21.08.0/debian/changelog	2021-09-02 20:53:54.000000000 +0000
@@ -1,3 +1,11 @@
+kalgebra (4:21.08.0-1+rpi1) bookworm-staging; urgency=medium
+
+  [changes brought forward from 4:17.08.3-2+rpi1 by Peter Michael Green <plugwash@raspbian.org> at Sat, 16 Dec 2017 12:52:33 +0000]
+  * Make armhf a non-webengine architecture.
+  * Fix clean target.
+
+ -- Raspbian forward porter <root@raspbian.org>  Thu, 02 Sep 2021 20:53:54 +0000
+
 kalgebra (4:21.08.0-1) unstable; urgency=medium
 
   [ Norbert Preining ]
diff -Nru kalgebra-21.08.0/debian/control kalgebra-21.08.0/debian/control
--- kalgebra-21.08.0/debian/control	2021-08-16 06:47:11.000000000 +0000
+++ kalgebra-21.08.0/debian/control	2021-09-02 20:53:54.000000000 +0000
@@ -26,7 +26,7 @@
                qtbase5-dev (>= 5.15~),
                qtdeclarative5-dev (>= 5.15~),
                qtquickcontrols2-5-dev,
-               qtwebengine5-dev [amd64 arm64 armhf i386 mipsel],
+               qtwebengine5-dev [amd64 arm64 i386 mipsel],
 Standards-Version: 4.5.1
 Homepage: https://edu.kde.org/kalgebra
 Vcs-Browser: https://salsa.debian.org/qt-kde-team/kde/kalgebra
@@ -34,7 +34,7 @@
 Rules-Requires-Root: no
 
 Package: kalgebra
-Architecture: amd64 arm64 armhf i386 mipsel
+Architecture: amd64 arm64 i386 mipsel
 Section: math
 Depends: kalgebra-common (= ${binary:Version}),
          ${misc:Depends},
@@ -47,7 +47,7 @@
  This package is part of the KDE education module.
 
 Package: kalgebra-common
-Architecture: amd64 arm64 armhf i386 mipsel
+Architecture: amd64 arm64 i386 mipsel
 Section: math
 Depends: plasma-framework,
          qml-module-org-kde-analitza,
@@ -64,7 +64,7 @@
 Package: kalgebramobile
 Architecture: any
 Section: math
-Depends: kalgebra-common (= ${binary:Version}) [amd64 arm64 armhf i386 mipsel],
+Depends: kalgebra-common (= ${binary:Version}) [amd64 arm64 i386 mipsel],
          plasma-framework,
          qml-module-org-kde-kirigami2,
          qml-module-qtqml-models2,
diff -Nru kalgebra-21.08.0/debian/rules kalgebra-21.08.0/debian/rules
--- kalgebra-21.08.0/debian/rules	2020-08-16 23:44:26.000000000 +0000
+++ kalgebra-21.08.0/debian/rules	2021-09-02 20:53:54.000000000 +0000
@@ -12,7 +12,7 @@
 
 include /usr/share/dpkg/architecture.mk
 
-webengine_archs := amd64 arm64 armhf i386 mipsel
+webengine_archs := amd64 arm64 i386 mipsel
 
 %:
 	dh $@ --with kf5
@@ -21,3 +21,7 @@
 override_dh_auto_configure:
 	dh_auto_configure --buildsystem=kf5 -- -DMOBILE_BACKEND="none"
 endif
+
+override_dh_auto_clean:
+	dh_auto_clean
+	rm -rf debian/kalgebra