extra/cantor to 20.08.3-3

extra/cantor/PKGBUILD

@@ -7,7 +7,7 @@
 
 pkgname=cantor
 pkgver=20.08.3
-pkgrel=1
+pkgrel=3
 pkgdesc="KDE Frontend to Mathematical Software"
 url="https://kde.org/applications/education/cantor/"
 arch=(x86_64)
@@ -22,12 +22,19 @@ optdepends=('maxima: Maxima backend'
             'python: Python 3 backend'
             'sagemath: SageMath backend'
             'julia: Julia backend')
-source=("https://download.kde.org/stable/release-service/$pkgver/src/$pkgname-$pkgver.tar.xz"{,.sig})
+source=("https://download.kde.org/stable/release-service/$pkgver/src/$pkgname-$pkgver.tar.xz"{,.sig}
+        $pkgname-py39.patch::https://invent.kde.org/education/cantor/-/commit/c794fb5f0f61.patch)
 sha256sums=('14aefe60ca2ff7aeaf7af8080dd00e80be8d747faeb9cd5a2df88f0d3af358da'
-            'SKIP')
+            'SKIP'
+            'cacf5ecf60fcf420b7bfeb0248d412f3a7272cf6d4e591e2f4c040a7b3b18800')
 validpgpkeys=(CA262C6C83DE4D2FB28A332A3A6A4DB839EAA6D7  # Albert Astals Cid <aacid@kde.org>
               F23275E4BF10AFC1DF6914A6DBD2CE893E2D1C87) # Christoph Feck <cfeck@kde.org>
 
+prepare() {
+  cd $pkgname-$pkgver
+  patch -Np1 -i ../$pkgname-py39.patch
+}
+
 build() {
   cmake -B build -S $pkgname-$pkgver \
     -DBUILD_TESTING=OFF