diff -up kde-workspace-4.10.5/kcontrol/krdb/krdb.cpp.krdb kde-workspace-4.10.5/kcontrol/krdb/krdb.cpp
--- kde-workspace-4.10.5/kcontrol/krdb/krdb.cpp.krdb	2013-06-28 19:10:44.184424737 +0200
+++ kde-workspace-4.10.5/kcontrol/krdb/krdb.cpp	2014-07-16 17:22:30.084547381 +0200
@@ -538,9 +539,9 @@ void runRdb( uint flags )
 
   KProcess proc;
 #ifndef NDEBUG
-  proc << "xrdb" << "-merge" << tmpFile.fileName();
+  proc << "xrdb" << "-cpp" << "/bin/cpp" << "-merge" << tmpFile.fileName();
 #else
-  proc << "xrdb" << "-quiet" << "-merge" << tmpFile.fileName();
+  proc << "xrdb" << "-cpp" << "/bin/cpp" << "-quiet" << "-merge" << tmpFile.fileName();
 #endif
   proc.execute();