diff --git a/waflib/Build.py b/waflib/Build.py
index b49dd830..e4f5050e 100644
--- a/waflib/Build.py
+++ b/waflib/Build.py
@@ -109,7 +109,7 @@ class BuildContext(Context.Context):
 		self.keep = Options.options.keep
 		"""Whether the build should continue past errors"""
 
-		self.progress_bar = Options.options.progress_bar
+		self.progress_bar = getattr(Options.options, 'progress_bar', 0)
 		"""
 		Level of progress status:
 
diff --git a/waflib/Configure.py b/waflib/Configure.py
index ca64f981..edb6f584 100644
--- a/waflib/Configure.py
+++ b/waflib/Configure.py
@@ -95,7 +95,7 @@ class ConfigurationContext(Context.Context):
 
 		top = self.top_dir
 		if not top:
-			top = Options.options.top
+			top = getattr(Options.options, 'top', None)
 		if not top:
 			top = getattr(Context.g_module, Context.TOP, None)
 		if not top:
@@ -107,7 +107,7 @@ class ConfigurationContext(Context.Context):
 
 		out = self.out_dir
 		if not out:
-			out = Options.options.out
+			out = getattr(Options.options, 'out', None)
 		if not out:
 			out = getattr(Context.g_module, Context.OUT, None)
 		if not out:
diff --git a/waflib/Scripting.py b/waflib/Scripting.py
index 05e3beef..1bb074e4 100644
--- a/waflib/Scripting.py
+++ b/waflib/Scripting.py
@@ -56,10 +56,10 @@ def waf_entry_point(current_directory, version, wafdir):
 	if options.version:
 		print('%s %s (%s)'%(Context.WAFNAME, Context.WAFVERSION, Context.WAFREVISION))
 		sys.exit(0)
-	if options.top:
+	if getattr(options, 'top', None):
 		start_dir = Context.run_dir = Context.top_dir = options.top
 		no_climb = True
-	if options.out:
+	if getattr(options, 'out', None):
 		Context.out_dir = options.out
 
 	# if 'configure' is in the commands, do not search any further