diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,8 +23,6 @@
 include(KDECompilerSettings NO_POLICY_SCOPE)
 include(KDEClangFormat)
 
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.h.cmake kded/config.h)
-
 add_subdirectory(gtkproxies)
 add_subdirectory(gtk3proxies)
 add_subdirectory(kded)
diff --git a/config.h.cmake b/config.h.cmake
deleted file mode 100644
--- a/config.h.cmake
+++ /dev/null
@@ -1 +0,0 @@
-#define CMAKE_INSTALL_FULL_LIBEXECDIR "@CMAKE_INSTALL_FULL_LIBEXECDIR@"
diff --git a/kded/CMakeLists.txt b/kded/CMakeLists.txt
--- a/kded/CMakeLists.txt
+++ b/kded/CMakeLists.txt
@@ -8,8 +8,9 @@
 add_library(gtkconfig MODULE ${kscreen_daemon_SRCS})
 
 target_compile_definitions(gtkconfig
-  PUBLIC
-    -DQT_NO_SIGNALS_SLOTS_KEYWORDS
+  PRIVATE
+    QT_NO_SIGNALS_SLOTS_KEYWORDS
+    LIBEXECDIR="${CMAKE_INSTALL_FULL_LIBEXECDIR}"
 )
 
 target_include_directories(gtkconfig
diff --git a/kded/themepreviewer.cpp b/kded/themepreviewer.cpp
--- a/kded/themepreviewer.cpp
+++ b/kded/themepreviewer.cpp
@@ -34,13 +34,12 @@
 
 #include "themepreviewer.h"
 #include "configeditor.h"
-#include "config.h"
 
 const QString ThemePreviewer::previewGtk2ConfigPath = QStandardPaths::writableLocation(QStandardPaths::TempLocation) + QStringLiteral("/gtkrc-2.0");
 const QString ThemePreviewer::currentGtk2ConfigPath = QDir::homePath() + QStringLiteral("/.gtkrc-2.0");
-const QString ThemePreviewer::gtk2PreviewerExecutablePath = QStandardPaths::findExecutable(QStringLiteral("gtk_preview"), {CMAKE_INSTALL_FULL_LIBEXECDIR});
+const QString ThemePreviewer::gtk2PreviewerExecutablePath = QStandardPaths::findExecutable(QStringLiteral("gtk_preview"), {LIBEXECDIR});
 
-const QString ThemePreviewer::gtk3PreviewerExecutablePath = QStandardPaths::findExecutable(QStringLiteral("gtk3_preview"), {CMAKE_INSTALL_FULL_LIBEXECDIR});
+const QString ThemePreviewer::gtk3PreviewerExecutablePath = QStandardPaths::findExecutable(QStringLiteral("gtk3_preview"), {LIBEXECDIR});
 
 ThemePreviewer::ThemePreviewer(QObject *parent) : QObject(parent),
 gtk2PreviewerProccess(),