=== modified file 'src/ConfigParser.cc'
--- src/ConfigParser.cc	2013-07-22 01:26:09 +0000
+++ src/ConfigParser.cc	2013-07-29 16:50:58 +0000
@@ -280,7 +280,8 @@
         if (!token)
             token = NextElement(LastTokenType);
 
-        if (token &&  LastTokenType == ConfigParser::FunctionNameToken && strcmp("parameters", token) == 0) {
+        if (token && LastTokenType == ConfigParser::FunctionNameToken) {
+          if (strcmp("parameters", token) == 0) {
             char *path = NextToken();
             if (LastTokenType != ConfigParser::QuotedToken) {
                 debugs(3, DBG_CRITICAL, "Quoted filename missing: " << token);
@@ -311,11 +312,19 @@
             }
             CfgFiles.push(wordfile);
             token = NULL;
-        } else if (token &&  LastTokenType == ConfigParser::FunctionNameToken) {
-            debugs(3, DBG_CRITICAL, "Unknown cfg function: " << token);
-            self_destruct();
-            return NULL;
+        } else {
+            debugs(3, 3, "Unknown cfg function: " << token);
+
+            // we have determined tha the whole of this token is not a built-in function() style token
+            // ignore any further '(' as well
+            // concatenate this token, the '('-delimiter which confused things and next token.
+            // send to the undo queue for better processing next time around
+            LOCAL_ARRAY(char, tbuf, CONFIG_LINE_LIMIT);
+            const char *temp = NextElement(LastTokenType, false);
+            snprintf(tbuf, sizeof(tbuf)-1, "%s(%s", token, temp);
+            return (LastToken = tbuf);
         }
+      }
     } while (token == NULL && !CfgFiles.empty());
 
     return (LastToken = token);