stdin

diff --git a/wscript b/wscript
index d754199..1e79282 100644
--- a/wscript
+++ b/wscript
@@ -279,6 +279,9 @@ iconv support use --disable-iconv.",
         'name' : '--lua',
         'desc' : 'Lua',
         'func': check_lua,
+        'req': True,
+        'fmsg': "Unable to find development files for lua. Aborting. \
+If you really mean to compile without lua support use --disable-lua."
     }, {
         'name': '--libass',
         'desc': 'SSA/ASS support',