Index: /issm/trunk-jpl/src/m/plot/plot_manager.py
===================================================================
--- /issm/trunk-jpl/src/m/plot/plot_manager.py	(revision 17953)
+++ /issm/trunk-jpl/src/m/plot/plot_manager.py	(revision 17954)
@@ -11,5 +11,14 @@
 from plot_unit import plot_unit
 from applyoptions import applyoptions
-from plot_overlay import plot_overlay
+
+try:
+	from osgeo import gdal
+	overlaysupport=True
+except ImportError:
+	print 'osgeo/gdal for python not installed, overlay plots are not enabled'
+	overlaysupport=False
+
+if overlaysupport:
+	from plot_overlay import plot_overlay
 
 def plot_manager(md,options,fig,ax):
@@ -45,5 +54,5 @@
 
 	#overlay plot
-	if options.exist('overlay'):
+	if options.exist('overlay') and overlaysupport:
 		plot_overlay(md,data,options,ax)
 		options.addfielddefault('alpha',0.5)