diff --git a/Library/Homebrew/cli/args.rbi b/Library/Homebrew/cli/args.rbi
index 3dbdf28fb8a0c..552720dbafc3a 100644
--- a/Library/Homebrew/cli/args.rbi
+++ b/Library/Homebrew/cli/args.rbi
@@ -3,6 +3,9 @@
 module Homebrew
   module CLI
     class Args < OpenStruct
+      sig { returns(T::Boolean) }
+      def strict?; end
+
       sig { returns(T::Boolean) }
       def HEAD?; end
 
diff --git a/Library/Homebrew/dev-cmd/linkage.rb b/Library/Homebrew/dev-cmd/linkage.rb
index d765f9ac5fbe8..21b69593df5a6 100644
--- a/Library/Homebrew/dev-cmd/linkage.rb
+++ b/Library/Homebrew/dev-cmd/linkage.rb
@@ -20,6 +20,9 @@ def linkage_args
       switch "--test",
              description: "Show only missing libraries and exit with a non-zero status if any missing "\
                           "libraries are found."
+      switch "--strict",
+             depends_on:  "--test",
+             description: "Exit with a non-zero status if any undeclared dependencies with linkage are found."
       switch "--reverse",
              description: "For every library that a keg references, print its dylib path followed by the "\
                           "binaries that link to it."
@@ -46,8 +49,8 @@ def linkage
         result = LinkageChecker.new(keg, cache_db: db)
 
         if args.test?
-          result.display_test_output
-          Homebrew.failed = true if result.broken_library_linkage?
+          result.display_test_output(strict: args.strict?)
+          Homebrew.failed = true if result.broken_library_linkage?(strict: args.strict?)
         elsif args.reverse?
           result.display_reverse_output
         else
diff --git a/Library/Homebrew/linkage_checker.rb b/Library/Homebrew/linkage_checker.rb
index 9af36adb0e65a..116abd76b10c8 100644
--- a/Library/Homebrew/linkage_checker.rb
+++ b/Library/Homebrew/linkage_checker.rb
@@ -62,17 +62,19 @@ def display_reverse_output
     end
   end
 
-  def display_test_output(puts_output: true)
+  def display_test_output(puts_output: true, strict: false)
     display_items "Missing libraries", broken_dylibs_with_expectations, puts_output: puts_output
     display_items "Unused missing linkage information", unexpected_present_dylibs, puts_output: puts_output
     display_items "Broken dependencies", @broken_deps, puts_output: puts_output
     display_items "Unwanted system libraries", @unwanted_system_dylibs, puts_output: puts_output
     display_items "Conflicting libraries", @version_conflict_deps, puts_output: puts_output
+    display_items "Undeclared dependencies with linkage", @undeclared_deps, puts_output: puts_output if strict
   end
 
-  sig { returns(T::Boolean) }
-  def broken_library_linkage?
+  sig { params(strict: T::Boolean).returns(T::Boolean) }
+  def broken_library_linkage?(strict: false)
     issues = [@broken_deps, @unwanted_system_dylibs, @version_conflict_deps]
+    issues << @undeclared_deps if strict
     [issues, unexpected_broken_dylibs, unexpected_present_dylibs].flatten.any?(&:present?)
   end