buid.py: Show help message when no arguments are specified

utils/build.py

@@ -9,6 +9,7 @@ except ImportError:
 
 import os
 import tempfile
+import sys
 
 
 def merge(files):
@@ -398,6 +399,11 @@ def parse_args():
 
 		args, remainder = parser.parse_args()
 
+	# If no arguments have been passed, show the help message and exit
+	if len(sys.argv) == 1:
+		parser.print_help()
+		sys.exit(1)
+
 	return args