diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@
 
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules ${CMAKE_MODULE_PATH} )
 
-find_package(ECM 0.0.11 REQUIRED NO_MODULE)
+find_package(ECM 5.38 REQUIRED NO_MODULE)
 
 include(FeatureSummary)
 include(WriteBasicConfigVersionFile)
diff --git a/autotests/CMakeLists.txt b/autotests/CMakeLists.txt
--- a/autotests/CMakeLists.txt
+++ b/autotests/CMakeLists.txt
@@ -359,7 +359,6 @@
 # Test X11 TimestampUpdate
 ########################################################
 add_executable(testX11TimestampUpdate test_x11_timestamp_update.cpp)
-target_compile_definitions(testX11TimestampUpdate PRIVATE KWINBACKENDPATH="${CMAKE_BINARY_DIR}/plugins/platforms/x11/standalone/KWinX11Platform.so")
 target_link_libraries(testX11TimestampUpdate
     Qt5::Test
     KF5::CoreAddons
diff --git a/autotests/integration/CMakeLists.txt b/autotests/integration/CMakeLists.txt
--- a/autotests/integration/CMakeLists.txt
+++ b/autotests/integration/CMakeLists.txt
@@ -1,5 +1,3 @@
-add_definitions(-DKWINBACKENDPATH="${CMAKE_BINARY_DIR}/plugins/platforms/virtual/KWinWaylandVirtualBackend.so")
-add_definitions(-DKWINQPAPATH="${CMAKE_BINARY_DIR}/plugins/qpa/")
 add_subdirectory(helper)
 
 add_library(KWinIntegrationTestFramework STATIC kwin_wayland_test.cpp test_helpers.cpp)
diff --git a/autotests/integration/kwin_wayland_test.h b/autotests/integration/kwin_wayland_test.h
--- a/autotests/integration/kwin_wayland_test.h
+++ b/autotests/integration/kwin_wayland_test.h
@@ -174,7 +174,7 @@
 int main(int argc, char *argv[]) \
 { \
     setenv("QT_QPA_PLATFORM", "wayland-org.kde.kwin.qpa", true); \
-    setenv("QT_QPA_PLATFORM_PLUGIN_PATH", KWINQPAPATH, true); \
+    setenv("QT_QPA_PLATFORM_PLUGIN_PATH", QFileInfo(QString::fromLocal8Bit(argv[0])).absolutePath().toLocal8Bit().constData(), true); \
     setenv("KWIN_FORCE_OWN_QPA", "1", true); \
     DPI; \
     KWin::WaylandTestApplication app(argc, argv); \
diff --git a/autotests/integration/kwin_wayland_test.cpp b/autotests/integration/kwin_wayland_test.cpp
--- a/autotests/integration/kwin_wayland_test.cpp
+++ b/autotests/integration/kwin_wayland_test.cpp
@@ -52,7 +52,7 @@
     setUseKActivities(false);
 #endif
     qputenv("KWIN_COMPOSE", QByteArrayLiteral("Q"));
-    initPlatform(KPluginMetaData(QStringLiteral(KWINBACKENDPATH)));
+    initPlatform(KPluginMetaData(QStringLiteral("KWinWaylandVirtualBackend.so")));
     WaylandServer::create(this);
 }
 
diff --git a/autotests/integration/shell_client_test.cpp b/autotests/integration/shell_client_test.cpp
--- a/autotests/integration/shell_client_test.cpp
+++ b/autotests/integration/shell_client_test.cpp
@@ -705,7 +705,7 @@
 {
     // this test verifies that killWindow properly terminates a process
     // for this an external binary is launched
-    const QString kill = QFINDTESTDATA(QStringLiteral("helper/kill"));
+    const QString kill = QFINDTESTDATA(QStringLiteral("kill"));
     QVERIFY(!kill.isEmpty());
     QSignalSpy shellClientAddedSpy(waylandServer(), &WaylandServer::shellClientAdded);
     QVERIFY(shellClientAddedSpy.isValid());
diff --git a/autotests/integration/xclipboardsync_test.cpp b/autotests/integration/xclipboardsync_test.cpp
--- a/autotests/integration/xclipboardsync_test.cpp
+++ b/autotests/integration/xclipboardsync_test.cpp
@@ -97,9 +97,9 @@
 void XClipboardSyncTest::testSync()
 {
     // this test verifies the syncing of X11 to Wayland clipboard
-    const QString copy = QFINDTESTDATA(QStringLiteral("helper/copy"));
+    const QString copy = QFINDTESTDATA(QStringLiteral("copy"));
     QVERIFY(!copy.isEmpty());
-    const QString paste = QFINDTESTDATA(QStringLiteral("helper/paste"));
+    const QString paste = QFINDTESTDATA(QStringLiteral("paste"));
     QVERIFY(!paste.isEmpty());
 
     QSignalSpy clientAddedSpy(workspace(), &Workspace::clientAdded);
diff --git a/autotests/test_x11_timestamp_update.cpp b/autotests/test_x11_timestamp_update.cpp
--- a/autotests/test_x11_timestamp_update.cpp
+++ b/autotests/test_x11_timestamp_update.cpp
@@ -46,7 +46,7 @@
 {
     setX11Connection(QX11Info::connection());
     setX11RootWindow(QX11Info::appRootWindow());
-    initPlatform(KPluginMetaData(QStringLiteral(KWINBACKENDPATH)));
+    initPlatform(KPluginMetaData(QStringLiteral("KWinX11Platform.so")));
 }
 
 X11TestApplication::~X11TestApplication()