diff --git a/Modules/DeployQt4.cmake b/Modules/DeployQt4.cmake
index bdf83604a6..4bf1b6c4ba 100644
--- a/Modules/DeployQt4.cmake
+++ b/Modules/DeployQt4.cmake
@@ -56,7 +56,7 @@
 # (or <plugins_dir>) relative to <executable> and store the result in
 # <installed_plugin_path_var>. See documentation of INSTALL_QT4_PLUGIN_PATH.
 #
-#  INSTALL_QT4_EXECUTABLE(<executable> <qtplugins> [<libs> <dirs> <plugins_dir> <request_qt_conf>])
+#  INSTALL_QT4_EXECUTABLE(<executable> [<qtplugins> <libs> <dirs> <plugins_dir> <request_qt_conf>])
 # Installs Qt plugins, writes a Qt configuration file (if needed) and fixes up
 # a Qt4 executable using BundleUtilities so it is standalone and can be
 # drag-and-drop copied to another machine as long as all of the system
@@ -106,7 +106,8 @@ function(resolve_qt4_paths paths_var)
         set(${paths_var} ${paths_resolved} PARENT_SCOPE)
 endfunction()
 
-function(fixup_qt4_executable executable qtplugins)
+function(fixup_qt4_executable executable)
+        set(qtplugins ${ARGV1})
         set(libs ${ARGV2})
         set(dirs ${ARGV3})
         set(plugins_dir ${ARGV4})
@@ -150,7 +151,6 @@ function(fixup_qt4_executable executable qtplugins)
         endforeach()
 
         resolve_qt4_paths(libs "${executable_path}")
-        resolve_qt4_paths(dirs "${executable_path}")
 
         if(write_qt_conf)
                 set(qt_conf_contents "[Paths]\nPlugins = ${plugins_dir}")
@@ -225,9 +225,11 @@ function(install_qt4_plugin plugin executable copy installed_plugin_path_var)
                 else()
                         string(TOUPPER "QT_${plugin}_PLUGIN" plugin_var)
                 endif()
-                set(plugin_release "${${plugin_var}_RELEASE}")
-                set(plugin_debug "${${plugin_var}_DEBUG}")
-                if(NOT EXISTS "${plugin_release}" AND NOT EXISTS "${plugin_debug}")
+                set(plugin_release_var "${plugin_var}_RELEASE")
+                set(plugin_debug_var "${plugin_var}_DEBUG")
+                set(plugin_release "${${plugin_release_var}}")
+                set(plugin_debug "${${plugin_debug_var}}")
+                if(DEFINED "${plugin_release_var}" AND DEFINED "${plugin_debug_var}" AND NOT EXISTS "${plugin_release}" AND NOT EXISTS "${plugin_debug}")
                         message(WARNING "Qt plugin \"${plugin}\" not recognized or found.")
                 endif()
                 install_qt4_plugin_path("${plugin_release}" "${executable}" "${copy}" "${installed_plugin_path_var}" "${plugins_dir}" "${component}" "Release|RelWithDebInfo|MinSizeRel")
@@ -264,7 +266,6 @@ function(install_qt4_executable executable)
         endforeach()
 
         resolve_qt4_paths(libs)
-        resolve_qt4_paths(dirs)
 
         install(CODE
                 " INCLUDE( \"${DeployQt4_cmake_dir}/DeployQt4.cmake\" )