diff --git a/0001-Fix-build-with-CMake-3.20.patch b/0001-Fix-build-with-CMake-3.20.patch
new file mode 100644
index 0000000..1fa2555
--- /dev/null
+++ b/0001-Fix-build-with-CMake-3.20.patch
@@ -0,0 +1,29 @@
+From c1b7769c37c70d189d09d8dc104d0541433b58b6 Mon Sep 17 00:00:00 2001
+From: Christophe Giboudeaux <christophe@krop.fr>
+Date: Wed, 12 May 2021 07:27:48 +0200
+Subject: [PATCH] Fix build with CMake 3.20
+
+---
+ CMakeLists.txt | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index dfb3bf8..b7c75f0 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -112,10 +112,10 @@ elseif(kst_3rdparty_download)
+         elseif(GCC_VERSION VERSION_EQUAL 4.7 OR GCC_VERSION VERSION_GREATER 4.7)
+             set(ver 4.7)
+             set(md5 de6e8dbab1bb17eee6057941fddc93e3)
+-        else(GCC_VERSION VERSION_EQUAL 4.6 OR GCC_VERSION VERSION_GREATER 4.6)
++        elseif(GCC_VERSION VERSION_EQUAL 4.6 OR GCC_VERSION VERSION_GREATER 4.6)
+             set(ver 4.6)
+             set(md5 70d8670af9c21eb8fb466654c95d8e4d)
+-        else(GCC_VERSION VERSION_GREATER 4.4)
++        elseif(GCC_VERSION VERSION_GREATER 4.4)
+             set(ver 4.4)
+             set(md5 999248fb40a44543af4dd4cd1be0ceeb)
+         else()
+-- 
+2.31.1
+
diff --git a/kst.changes b/kst.changes
index 2046825..58cb196 100644
--- a/kst.changes
+++ b/kst.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed May 12 05:29:54 UTC 2021 - Christophe Giboudeaux <christophe@krop.fr>
+
+- Add patch to fix build with CMake 3.20:
+  * 0001-Fix-build-with-CMake-3.20.patch
+
 -------------------------------------------------------------------
 Tue Jul 21 07:34:52 UTC 2020 - Michel Normand <normand@linux.vnet.ibm.com>
 
diff --git a/kst.spec b/kst.spec
index 73c9d0e..2dbc7c3 100644
--- a/kst.spec
+++ b/kst.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package kst
 #
-# Copyright (c) 2020 SUSE LLC
+# Copyright (c) 2021 SUSE LLC
 # Copyright (c) 2011 Christian Trippe ctrippe@opensuse.org
 #
 # All modifications and additions to the file contributed by third parties
@@ -29,6 +29,8 @@ Source:         Kst-%{version}.tar.gz
 Patch0:         gsl2-support.patch
 # PATCH-FIX-UPSTREAM -- Fix-build-with-Qt-511.patch -- Fixes build with Qt 5.11
 Patch1:         Fix-build-with-Qt-511.patch
+# PATCH-FIX-UPSTREAM
+Patch2:         0001-Fix-build-with-CMake-3.20.patch
 BuildRequires:  Mesa-devel
 BuildRequires:  cmake
 BuildRequires:  fdupes
@@ -93,7 +95,7 @@ EXTRA_FLAGS="-Dkst_install_prefix=%{_prefix} \
              -Dkst_qt5=1"
 
 %cmake $EXTRA_FLAGS
-make %{?_smp_mflags}
+%cmake_build
 
 %install
 %cmake_install