Only look for libraries in lib if it exists

Fixes Homebrew/homebrew#40630.

1 files changed, 1 insertions, 1 deletions

diff --git a/Library/Homebrew/keg_fix_install_names.rb b/Library/Homebrew/keg_fix_install_names.rb
index c3f618a4c..4608f5a4c 100644
--- a/Library/Homebrew/keg_fix_install_names.rb
+++ b/Library/Homebrew/keg_fix_install_names.rb
@@ -148,7 +148,7 @@ class Keg
   end
 
   def find_dylib name
-    lib.find { |pn| break pn if pn.basename == name }
+    lib.find { |pn| break pn if pn.basename == name } if lib.directory?
   end
 
   def mach_o_files