audit: fix for no compat mode

Closes Homebrew/homebrew#40731.

Signed-off-by: Xu Cheng <xucheng@me.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/Library/Homebrew/cmd/audit.rb b/Library/Homebrew/cmd/audit.rb
index 83d37051a..10f2ab53f 100644
--- a/Library/Homebrew/cmd/audit.rb
+++ b/Library/Homebrew/cmd/audit.rb
@@ -171,15 +171,15 @@ class FormulaAuditor
       end
     end
 
-    if formula.class < GithubGistFormula
+    if Object.const_defined?("GithubGistFormula") && formula.class < GithubGistFormula
       problem "GithubGistFormula is deprecated, use Formula instead"
     end
 
-    if formula.class < ScriptFileFormula
+    if Object.const_defined?("ScriptFileFormula") && formula.class < ScriptFileFormula
       problem "ScriptFileFormula is deprecated, use Formula instead"
     end
 
-    if formula.class < AmazonWebServicesFormula
+    if Object.const_defined?("AmazonWebServicesFormula") && formula.class < AmazonWebServicesFormula
       problem "AmazonWebServicesFormula is deprecated, use Formula instead"
     end
   end