diff --git a/libs.autobuild b/libs.autobuild
index 9739802..a7140be 100644
--- a/libs.autobuild
+++ b/libs.autobuild
@@ -20,8 +20,16 @@ def mars_package(srcDir,type = :cmake_package)
 end
 
 
-mars_package("simulation/mars/common/gui/config_map_gui")
-mars_package("simulation/mars/common/gui/gui_app")
+mars_package("simulation/mars/common/gui/config_map_gui") do |pkg|
+    pkg.depends_on "qt5"
+    pkg.define "USE_QT5", "1"
+    pkg.env_set "USE_QT5", "1"
+end
+mars_package("simulation/mars/common/gui/gui_app") do |pkg|
+    pkg.depends_on "qt5"
+    pkg.define "USE_QT5", "1"
+    pkg.env_set "USE_QT5", "1"
+end
 mars_package("simulation/mars/entity_generation/primitives")
 mars_package("simulation/mars/plugins/entity_view")
 mars_package("simulation/mars/plugins/SkyDomePlugin")
@@ -38,7 +46,11 @@ mars_package("simulation/mars/plugins/PythonMars") do |pkg|
 end
 mars_package("simulation/mars/common/gui/data_broker_plotter2")
 cmake_package("simulation/mars_extensions/data_broker_graph_view")
-cmake_package("external/osgQt")
+cmake_package("external/osgQt") do |pkg|
+    pkg.depends_on "qt5"
+    pkg.define "USE_QT5", "1"
+    pkg.env_set "USE_QT5", "1"
+end
 
 in_flavor 'stable' do
     mars_package("simulation/mars/scripts/cmake")
@@ -47,7 +59,11 @@ end
 in_flavor 'master','stable' do
     mars_package("simulation/mars/entity_generation/entity_factory")
     mars_package("simulation/mars/entity_generation/smurf")
-    mars_package("simulation/mars/smurf_loader")
+    mars_package("simulation/mars/smurf_loader") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
     mars_package("simulation/mars/plugins/Text3D")
     mars_package("simulation/mars/common/graphics/osg_text")
     mars_package("simulation/mars/common/graphics/osg_text_factory")
@@ -60,11 +76,30 @@ in_flavor 'master','stable' do
     metapackage 'simulation/configmaps', 'tools/configmaps'
 
     mars_package("simulation/mars/common/cfg_manager")
-    mars_package("simulation/mars/common/gui/main_gui")
-    mars_package("simulation/mars/common/data_broker")
-    mars_package("simulation/mars/common/gui/cfg_manager_gui")
-    mars_package("simulation/mars/common/gui/lib_manager_gui")
-    mars_package("simulation/mars/common/gui/log_console")
+    mars_package("simulation/mars/common/gui/main_gui") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
+    mars_package("simulation/mars/common/data_broker") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.env_set "USE_QT5", "1"
+    end
+    mars_package("simulation/mars/common/gui/cfg_manager_gui") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
+    mars_package("simulation/mars/common/gui/lib_manager_gui") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
+    mars_package("simulation/mars/common/gui/log_console") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
     mars_package("simulation/mars/common/gui/data_broker_gui")
     mars_package("simulation/mars/common/gui/data_broker_plotter")
     mars_package("simulation/mars/common/utils")
@@ -74,16 +109,39 @@ in_flavor 'master','stable' do
         #to enable the autostart of mars
         pkg.define "DEFAULT_CONFIG_DIR", File.join(Autobuild.prefix,"configuration","mars_default")
     end
-    mars_package("simulation/mars/gui")
+    mars_package("simulation/mars/gui") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
     mars_package("simulation/mars/graphics")
     mars_package("simulation/mars/app") do |pkg|
         pkg.define "DEFAULT_CONFIG_DIR", File.join(Autobuild.prefix,"configuration","mars_default")
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
+    mars_package("simulation/mars/viz") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
+    mars_package("simulation/mars/scene_loader") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
+    mars_package("simulation/mars/plugins/connexion_plugin") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
     end
-    mars_package("simulation/mars/viz")
-    mars_package("simulation/mars/scene_loader")
-    mars_package("simulation/mars/plugins/connexion_plugin")
     mars_package("simulation/mars/plugins/VirtualJoystickPlugin")
-    mars_package("simulation/mars/plugins/constraint_plugin")
+    mars_package("simulation/mars/plugins/constraint_plugin") do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
     mars_package("simulation/mars/plugins/connectors")
     
     mars_package("simulation/mars/doc",:import_package) do |pkg|
diff --git a/orogen.autobuild b/orogen.autobuild
index fb8bd44..07a2cfc 100644
--- a/orogen.autobuild
+++ b/orogen.autobuild
@@ -5,6 +5,10 @@ in_flavor 'master' do
 end
 
 in_flavor 'master', 'stable' do
-    orogen_package 'simulation/orogen/mars'
+    orogen_package 'simulation/orogen/mars' do |pkg|
+        pkg.depends_on "qt5"
+        pkg.define "USE_QT5", "1"
+        pkg.env_set "USE_QT5", "1"
+    end
     orogen_package 'simulation/orogen/mars_addons'
 end