diff --git a/pkgs/kde/frameworks/extra-cmake-modules/default.nix b/pkgs/kde/frameworks/extra-cmake-modules/default.nix
index a7711db03ddf..ce9b5e6df4f8 100644
--- a/pkgs/kde/frameworks/extra-cmake-modules/default.nix
+++ b/pkgs/kde/frameworks/extra-cmake-modules/default.nix
@@ -6,6 +6,10 @@
 mkKdeDerivation {
   pname = "extra-cmake-modules";
 
+  # Don't depend on qdoc (leaks everywhere, causes random cross issues), we don't install the docs anyway
+  # Upstream PR: https://invent.kde.org/frameworks/extra-cmake-modules/-/merge_requests/534
+  patches = [ ./no-qdoc.patch ];
+
   outputs = [ "out" ];
 
   propagatedNativeBuildInputs = [
diff --git a/pkgs/kde/frameworks/extra-cmake-modules/no-qdoc.patch b/pkgs/kde/frameworks/extra-cmake-modules/no-qdoc.patch
new file mode 100644
index 000000000000..aac013520510
--- /dev/null
+++ b/pkgs/kde/frameworks/extra-cmake-modules/no-qdoc.patch
@@ -0,0 +1,20 @@
+diff --git a/modules/ECMGenerateQDoc.cmake b/modules/ECMGenerateQDoc.cmake
+index b6d64783314de790a5444c3c0d125b8e455883d9..68c570506fdc118ddef6249bce78051569298b4c 100644
+--- a/modules/ECMGenerateQDoc.cmake
++++ b/modules/ECMGenerateQDoc.cmake
+@@ -55,8 +55,13 @@ add_custom_target(generate_qch)
+ add_custom_target(install_qch_docs)
+ 
+ function(ecm_generate_qdoc target qdocconf_file)
+-    find_package(Qt6Tools CONFIG REQUIRED)
+-    find_package(Qt6 COMPONENTS ToolsTools CONFIG REQUIRED)
++    find_package(Qt6Tools CONFIG QUIET)
++    find_package(Qt6 OPTIONAL_COMPONENTS ToolsTools CONFIG QUIET)
++
++    if (NOT Qt6Tools_FOUND OR NOT Qt6ToolsTools_FOUND)
++        message(STATUS "Qt6Tools or Qt6ToolsTools not found, not generating API documentation")
++        return()
++    endif()
+ 
+     if (NOT TARGET ${target})
+         message(FATAL_ERROR "${target} is not a target")