--- ./attrs.c	Fri Aug  4 09:21:05 2000
+++ ../tidy4aug00/./attrs.c	Mon Aug  7 08:00:26 2000
@@ -416,7 +416,7 @@
 {
     Attribute *attrib = lookup(name);
 
-    if (attrib = null)
+    if (attrib == null)
         attrib = install(name, VERS_PROPRIETARY, null);
 
     attrib->literal = yes;