diff --git a/admin/scons/Platform.py b/admin/scons/Platform.py
index 3614e2561..b950f0045 100644
--- a/admin/scons/Platform.py
+++ b/admin/scons/Platform.py
@@ -108,7 +108,7 @@ def configure(env):
     if not conf.CheckPkgConfig('alsa', '1.0.23'):
         problems.append('Support for ALSA sound output is required')
     
-    if not conf.CheckPkgConfig('gtkmm-2.4', 2.8):
+    if not conf.CheckPkgConfig('gtkmm-3.0', 3.0):
         problems.append('Unable to configure GTK--')
         
     if not conf.CheckPkgConfig('glibmm-2.4', '2.16'):
@@ -120,8 +120,8 @@ def configure(env):
     if not conf.CheckPkgConfig('cairomm-1.0', 0.6):
         problems.append('Unable to configure Cairo--')
     
-    verGDL = '2.27.1'
-    if not conf.CheckPkgConfig('gdl-1.0', verGDL, alias='gdl'):
+    verGDL = '3.0.0'
+    if not conf.CheckPkgConfig('gdl-3.0', verGDL, alias='gdl'):
         print 'No sufficiently recent (>=%s) version of GDL found. Maybe use custom package gdl-lum?' % verGDL
         if not conf.CheckPkgConfig('gdl-lum', verGDL, alias='gdl'):
             problems.append('GNOME Docking Library not found. We either need a sufficiently recent GDL '
diff --git a/src/SConscript b/src/SConscript
index 8db741cfe..ac1424994 100644
--- a/src/SConscript
+++ b/src/SConscript
@@ -37,7 +37,7 @@ plugins = [] # currently none
 
 # the Lumiera GTK GUI
 envGtk = env.Clone()
-envGtk.mergeConf(['gtkmm-2.4','gthread-2.0','cairomm-1.0','gdl','xv','x11','xext','sm'])
+envGtk.mergeConf(['gtkmm-3.0','gthread-2.0','cairomm-1.0','gdl','xv','x11','xext','sm'])
 envGtk.Append(LIBS=core)
 
 guimodule = envGtk.LumieraPlugin('gtk_gui', srcSubtree('gui'), install=True)