diff --git a/kde-modules/KDECMakeSettings.cmake b/kde-modules/KDECMakeSettings.cmake
--- a/kde-modules/KDECMakeSettings.cmake
+++ b/kde-modules/KDECMakeSettings.cmake
@@ -84,6 +84,17 @@
 # should be downloaded when building the project.
 #
 # Since 5.34.0
+#
+# Flatpak builds
+# ~~~~~~~~~~~~~~
+# If there is a ``org.kde.app.json`` flatpak recipe in the git repository, an optional
+# ``build-flatpak`` target will be added to automate running ``flatpak-builder`` on it.
+#
+# Don't forget to run ``flatpak update`` after you run the target.
+#
+# See https://community.kde.org/Guidelines_and_HOWTOs/Flatpak#Compile_your_application
+#
+# Since 5.38
 
 #=============================================================================
 # Copyright 2014      Alex Merry <alex.merry@kde.org>
@@ -342,3 +353,26 @@
         DEPENDS "${CMAKE_BINARY_DIR}/releaseme"
     )
 endif()
+
+###################################################################
+# Build flatpak recipe
+
+function(_find_json_recipe json_recipe)
+    execute_process(COMMAND git ls-files *org.kde.*.json
+        OUTPUT_VARIABLE json
+        WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}")
+
+    set(${json_recipe} ${json})
+    set(${json_recipe} ${${json_recipe}} PARENT_SCOPE)
+endfunction()
+
+if(NOT TARGET build-flatpak)
+    set(_json_recipe "")
+    _find_json_recipe(_json_recipe)
+    if(_json_recipe)
+        string(TIMESTAMP _build_date)
+        add_custom_target(build-flatpak
+            COMMENT "Building flatpak recipe: ${_json_recipe}..."
+            COMMAND flatpak-builder --force-clean --ccache --require-changes --repo=repo --subject="Build of ${PROJECT_NAME}, ${_build_date}" app ${CMAKE_SOURCE_DIR}/${_json_recipe})
+    endif()
+endif()