nixpkgs/pkgs/desktops/plasma-5.5/libkscreen/libkscreen-backend-path.patch

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 460022f..422a708 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,5 +1,7 @@
 include_directories(${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR} ${CMAKE_CURRENT_BINARY_DIR} ${QT_INCLUDES})
 
+configure_file(config-libkscreen.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/config-libkscreen.h)
+
 set(libkscreen_SRCS
     backendloader.cpp
     config.cpp
diff --git a/src/backendloader.cpp b/src/backendloader.cpp
index b93e469..8aebc14 100644
--- a/src/backendloader.cpp
+++ b/src/backendloader.cpp
@@ -16,6 +16,7 @@
  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA       *
  *************************************************************************************/
 
+#include "config-libkscreen.h"
 #include "backendloader.h"
 #include "debug_p.h"
 #include "backends/abstractbackend.h"
@@ -40,55 +41,54 @@ bool BackendLoader::init()
     const QString backend = qgetenv("KSCREEN_BACKEND").constData();
     const QString backendFilter = QString::fromLatin1("KSC_%1*").arg(backend);
 
-    const QStringList paths = QCoreApplication::libraryPaths();
-    Q_FOREACH (const QString &path, paths) {
-        const QDir dir(path + QDir::separator() + QLatin1String("/kf5/kscreen/"),
-                       backendFilter,
-                       QDir::SortFlags(QDir::QDir::NoSort),
-                       QDir::NoDotAndDotDot | QDir::Files);
-        const QFileInfoList finfos = dir.entryInfoList();
-        Q_FOREACH (const QFileInfo &finfo, finfos) {
-            // Skip "Fake" backend unless explicitly specified via KSCREEN_BACKEND
-            if (backend.isEmpty() && finfo.fileName().contains(QLatin1String("KSC_Fake"))) {
-                continue;
-            }
+    QString path = QFile::decodeName(CMAKE_INSTALL_PREFIX "/" PLUGIN_INSTALL_DIR "/");
 
-            // When on X11, skip the QScreen backend, instead use the XRandR backend,
-            // if not specified in KSCREEN_BACKEND
-            if (backend.isEmpty() &&
-                    finfo.fileName().contains(QLatin1String("KSC_QScreen")) &&
-                    QX11Info::isPlatformX11()) {
-                continue;
-            }
+    const QDir dir(path + QDir::separator() + QLatin1String("/kf5/kscreen/"),
+                   backendFilter,
+                   QDir::SortFlags(QDir::QDir::NoSort),
+                   QDir::NoDotAndDotDot | QDir::Files);
+    const QFileInfoList finfos = dir.entryInfoList();
+    Q_FOREACH (const QFileInfo &finfo, finfos) {
+        // Skip "Fake" backend unless explicitly specified via KSCREEN_BACKEND
+        if (backend.isEmpty() && finfo.fileName().contains(QLatin1String("KSC_Fake"))) {
+            continue;
+        }
 
-            // When not on X11, skip the XRandR backend, and fall back to QSCreen
-            // if not specified in KSCREEN_BACKEND
-            if (backend.isEmpty() &&
-                    finfo.fileName().contains(QLatin1String("KSC_XRandR")) &&
-                    !QX11Info::isPlatformX11()) {
-                continue;
-            }
+        // When on X11, skip the QScreen backend, instead use the XRandR backend,
+        // if not specified in KSCREEN_BACKEND
+        if (backend.isEmpty() &&
+                finfo.fileName().contains(QLatin1String("KSC_QScreen")) &&
+                QX11Info::isPlatformX11()) {
+            continue;
+        }
+
+        // When not on X11, skip the XRandR backend, and fall back to QSCreen
+        // if not specified in KSCREEN_BACKEND
+        if (backend.isEmpty() &&
+                finfo.fileName().contains(QLatin1String("KSC_XRandR")) &&
+                !QX11Info::isPlatformX11()) {
+            continue;
+        }
 
-            QPluginLoader loader(finfo.filePath());
-            loader.load();
-            QObject *instance = loader.instance();
-            if (!instance) {
+        QPluginLoader loader(finfo.filePath());
+        loader.load();
+        QObject *instance = loader.instance();
+        if (!instance) {
+            loader.unload();
+            continue;
+        }
+
+        s_backend = qobject_cast< AbstractBackend* >(instance);
+        if (s_backend) {
+            if (!s_backend->isValid()) {
+                qCDebug(KSCREEN) << "Skipping" << s_backend->name() << "backend";
+                delete s_backend;
+                s_backend = 0;
                 loader.unload();
                 continue;
             }
-
-            s_backend = qobject_cast< AbstractBackend* >(instance);
-            if (s_backend) {
-                if (!s_backend->isValid()) {
-                    qCDebug(KSCREEN) << "Skipping" << s_backend->name() << "backend";
-                    delete s_backend;
-                    s_backend = 0;
-                    loader.unload();
-                    continue;
-                }
-                qCDebug(KSCREEN) << "Loading" << s_backend->name() << "backend";
-                return true;
-            }
+            qCDebug(KSCREEN) << "Loading" << s_backend->name() << "backend";
+            return true;
         }
     }
 
diff --git a/src/config-libkscreen.h.cmake b/src/config-libkscreen.h.cmake
new file mode 100644
index 0000000..a99f3d1
--- /dev/null
+++ b/src/config-libkscreen.h.cmake
@@ -0,0 +1,2 @@
+#define CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}"
+#define PLUGIN_INSTALL_DIR "${PLUGIN_INSTALL_DIR}"