xconv: Fix typo

lib/python/xconv/app.py

@@ -146,7 +146,7 @@ def main(argv):
     print("\033[36mXConv %s (c) Taeyeon Mori\033[0m" % version)
     print("\033[34mProfile: %s\033[0m" % args.profile)
 
-    unknown_defines = [n for n in args.defines.keys() if n not in profile.defines]
+    unknown_defines = [n for n in args.define.keys() if n not in profile.defines]
     if unknown_defines:
         print("\033[33mWarning: Unknown defines %s; see '%s -i %s' for avaliable defines in this profile\033[0m" %
               (", ".join(unknown_defines), argv[0], args.profile))