diff --git a/Library/Homebrew/cmd/list.rb b/Library/Homebrew/cmd/list.rb
index 9f863d180f..538baed2c1 100644
--- a/Library/Homebrew/cmd/list.rb
+++ b/Library/Homebrew/cmd/list.rb
@@ -245,6 +245,7 @@ module Homebrew
     class PrettyListing
       sig { params(path: T.any(String, Pathname, Keg)).void }
       def initialize(path)
+        valid_lib_extensions = [".dylib", ".pc"]
         Pathname.new(path).children.sort_by { |p| p.to_s.downcase }.each do |pn|
           case pn.basename.to_s
           when "bin", "sbin"
@@ -252,7 +253,7 @@ module Homebrew
           when "lib"
             print_dir pn do |pnn|
               # dylibs have multiple symlinks and we don't care about them
-              [".dylib", ".pc"].include?(pnn.extname) && !pnn.symlink?
+              valid_lib_extensions.include?(pnn.extname) && !pnn.symlink?
             end
           when ".brew"
             next # Ignore .brew
diff --git a/Library/Homebrew/extend/os/linux/extend/ENV/super.rb b/Library/Homebrew/extend/os/linux/extend/ENV/super.rb
index 0d2676055d..29ff410094 100644
--- a/Library/Homebrew/extend/os/linux/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/os/linux/extend/ENV/super.rb
@@ -29,7 +29,8 @@ module Superenv
     self["HOMEBREW_OPTIMIZATION_LEVEL"] = "O2"
     self["HOMEBREW_DYNAMIC_LINKER"] = determine_dynamic_linker_path
     self["HOMEBREW_RPATH_PATHS"] = determine_rpath_paths(@formula)
-    self["M4"] = "#{HOMEBREW_PREFIX}/opt/m4/bin/m4" if deps.any? { |d| ["libtool", "bison"].include?(d.name) }
+    m4_path_deps = ["libtool", "bison"]
+    self["M4"] = "#{HOMEBREW_PREFIX}/opt/m4/bin/m4" if deps.any? { m4_path_deps.include?(_1.name) }
   end
 
   def homebrew_extra_paths