diff --git a/SConstruct b/SConstruct
index c1466d66b..de7a7edc2 100644
--- a/SConstruct
+++ b/SConstruct
@@ -353,7 +353,7 @@ def defineBuildTargets(env, artifacts):
     
     # the Lumiera GTK GUI
     envGtk = env.Clone()
-    envGtk.mergeConf(['gtkmm-2.4','cairomm-1.0','gdl','xv','xext','sm'])
+    envGtk.mergeConf(['gtkmm-2.4','cairomm-1.0','gdl','gthread-2.0','xv','xext','sm'])
     envGtk.Append(CPPDEFINES='LUMIERA_PLUGIN', LIBS=core)
     
     objgui  = srcSubtree(envGtk,'$SRCDIR/gui')
diff --git a/src/tool/SConscript b/src/tool/SConscript
index e475fc057..d5e89270d 100644
--- a/src/tool/SConscript
+++ b/src/tool/SConscript
@@ -8,7 +8,7 @@ Import('env','artifacts','core')
 support_lib = artifacts['support']
 
 envSvg = env.Clone()
-envSvg.mergeConf(['librsvg-2.0'])
+envSvg.mergeConf(['librsvg-2.0','gthread-2.0'])
 envSvg.Append(LIBS=support_lib)
 
 
@@ -19,7 +19,7 @@ rsvg    = envSvg.Program('#$BINDIR/rsvg-convert','rsvg-convert.c')          ## f
 # build additional test and administrative tools....
 artifacts['tools'] = [ env.Program('#$BINDIR/hello-world','hello.c')      #### hello world (checks C build)      
                      + env.Program('#$BINDIR/try', 'try.cpp')             #### to try out some feature...
-                     + luidgen
+#                    + luidgen
                      + vgsuppr
                      + rsvg
                      ]