diff --git a/Library/Homebrew/extend/ENV.rb b/Library/Homebrew/extend/ENV.rb
index 051b6ac9e6..c0ff5610cc 100644
--- a/Library/Homebrew/extend/ENV.rb
+++ b/Library/Homebrew/extend/ENV.rb
@@ -35,7 +35,7 @@ module EnvActivation
     params(
       env:          T.nilable(String),
       cc:           T.nilable(String),
-      build_bottle: T.nilable(T::Boolean),
+      build_bottle: T::Boolean,
       bottle_arch:  T.nilable(String),
       _block:       T.proc.returns(T.untyped),
     ).returns(T.untyped)
diff --git a/Library/Homebrew/extend/ENV/shared.rb b/Library/Homebrew/extend/ENV/shared.rb
index d81f3328bc..2d1c85014a 100644
--- a/Library/Homebrew/extend/ENV/shared.rb
+++ b/Library/Homebrew/extend/ENV/shared.rb
@@ -35,13 +35,14 @@ module SharedEnvExtension
 
   sig {
     params(
-      formula:      T.nilable(Formula),
-      cc:           T.nilable(String),
-      build_bottle: T.nilable(T::Boolean),
-      bottle_arch:  T.nilable(T::Boolean),
+      formula:         T.nilable(Formula),
+      cc:              T.nilable(String),
+      build_bottle:    T.nilable(T::Boolean),
+      bottle_arch:     T.nilable(String),
+      testing_formula: T::Boolean,
     ).void
   }
-  def setup_build_environment(formula: nil, cc: nil, build_bottle: false, bottle_arch: nil)
+  def setup_build_environment(formula: nil, cc: nil, build_bottle: false, bottle_arch: nil, testing_formula: false)
     @formula = formula
     @cc = cc
     @build_bottle = build_bottle
diff --git a/Library/Homebrew/extend/ENV/std.rb b/Library/Homebrew/extend/ENV/std.rb
index b94f31533f..924155f83a 100644
--- a/Library/Homebrew/extend/ENV/std.rb
+++ b/Library/Homebrew/extend/ENV/std.rb
@@ -16,13 +16,14 @@ module Stdenv
   # @private
   sig {
     params(
-      formula:      T.nilable(Formula),
-      cc:           T.nilable(String),
-      build_bottle: T.nilable(T::Boolean),
-      bottle_arch:  T.nilable(T::Boolean),
+      formula:         T.nilable(Formula),
+      cc:              T.nilable(String),
+      build_bottle:    T.nilable(T::Boolean),
+      bottle_arch:     T.nilable(String),
+      testing_formula: T::Boolean,
     ).void
   }
-  def setup_build_environment(formula: nil, cc: nil, build_bottle: false, bottle_arch: nil)
+  def setup_build_environment(formula: nil, cc: nil, build_bottle: false, bottle_arch: nil, testing_formula: false)
     super
 
     self["HOMEBREW_ENV"] = "std"
diff --git a/Library/Homebrew/extend/ENV/super.rb b/Library/Homebrew/extend/ENV/super.rb
index aae72826bb..bacc76e7ea 100644
--- a/Library/Homebrew/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/ENV/super.rb
@@ -44,13 +44,14 @@ module Superenv
   # @private
   sig {
     params(
-      formula:      T.nilable(Formula),
-      cc:           T.nilable(String),
-      build_bottle: T.nilable(T::Boolean),
-      bottle_arch:  T.nilable(T::Boolean),
+      formula:         T.nilable(Formula),
+      cc:              T.nilable(String),
+      build_bottle:    T.nilable(T::Boolean),
+      bottle_arch:     T.nilable(String),
+      testing_formula: T::Boolean,
     ).void
   }
-  def setup_build_environment(formula: nil, cc: nil, build_bottle: false, bottle_arch: nil)
+  def setup_build_environment(formula: nil, cc: nil, build_bottle: false, bottle_arch: nil, testing_formula: false)
     super
     send(compiler)
 
diff --git a/Library/Homebrew/extend/os/linux/extend/ENV/std.rb b/Library/Homebrew/extend/os/linux/extend/ENV/std.rb
index 56d7793a57..79dba61cb4 100644
--- a/Library/Homebrew/extend/os/linux/extend/ENV/std.rb
+++ b/Library/Homebrew/extend/os/linux/extend/ENV/std.rb
@@ -3,7 +3,10 @@
 
 module Stdenv
   def setup_build_environment(formula: nil, cc: nil, build_bottle: false, bottle_arch: nil, testing_formula: false)
-    generic_setup_build_environment(formula: formula, cc: cc, build_bottle: build_bottle, bottle_arch: bottle_arch)
+    generic_setup_build_environment(
+      formula: formula, cc: cc, build_bottle: build_bottle,
+      bottle_arch: bottle_arch, testing_formula: testing_formula
+    )
 
     prepend_path "CPATH", HOMEBREW_PREFIX/"include"
     prepend_path "LIBRARY_PATH", HOMEBREW_PREFIX/"lib"
diff --git a/Library/Homebrew/extend/os/linux/extend/ENV/super.rb b/Library/Homebrew/extend/os/linux/extend/ENV/super.rb
index 2e6b36be95..07675d4135 100644
--- a/Library/Homebrew/extend/os/linux/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/os/linux/extend/ENV/super.rb
@@ -11,7 +11,10 @@ module Superenv
 
   # @private
   def setup_build_environment(formula: nil, cc: nil, build_bottle: false, bottle_arch: nil, testing_formula: false)
-    generic_setup_build_environment(formula: formula, cc: cc, build_bottle: build_bottle, bottle_arch: bottle_arch)
+    generic_setup_build_environment(
+      formula: formula, cc: cc, build_bottle: build_bottle,
+      bottle_arch: bottle_arch, testing_formula: testing_formula
+    )
     self["HOMEBREW_OPTIMIZATION_LEVEL"] = "O2"
     self["HOMEBREW_DYNAMIC_LINKER"] = determine_dynamic_linker_path
     self["HOMEBREW_RPATH_PATHS"] = determine_rpath_paths(@formula)
diff --git a/Library/Homebrew/extend/os/mac/extend/ENV/std.rb b/Library/Homebrew/extend/os/mac/extend/ENV/std.rb
index a51952a508..5500df0b5a 100644
--- a/Library/Homebrew/extend/os/mac/extend/ENV/std.rb
+++ b/Library/Homebrew/extend/os/mac/extend/ENV/std.rb
@@ -11,7 +11,10 @@ module Stdenv
   end
 
   def setup_build_environment(formula: nil, cc: nil, build_bottle: false, bottle_arch: nil, testing_formula: false)
-    generic_setup_build_environment(formula: formula, cc: cc, build_bottle: build_bottle, bottle_arch: bottle_arch)
+    generic_setup_build_environment(
+      formula: formula, cc: cc, build_bottle: build_bottle,
+      bottle_arch: bottle_arch, testing_formula: testing_formula
+    )
 
     # sed is strict, and errors out when it encounters files with
     # mixed character sets
diff --git a/Library/Homebrew/extend/os/mac/extend/ENV/super.rb b/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
index 2e3e3c13a7..456a985239 100644
--- a/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
@@ -121,7 +121,10 @@ module Superenv
       self["HOMEBREW_SDKROOT"] = nil
       self["HOMEBREW_DEVELOPER_DIR"] = nil
     end
-    generic_setup_build_environment(formula: formula, cc: cc, build_bottle: build_bottle, bottle_arch: bottle_arch)
+    generic_setup_build_environment(
+      formula: formula, cc: cc, build_bottle: build_bottle,
+      bottle_arch: bottle_arch, testing_formula: testing_formula
+    )
 
     # Filter out symbols known not to be defined since GNU Autotools can't
     # reliably figure this out with Xcode 8 and above.