diff --git a/CMakeLists.txt b/CMakeLists.txt
index e0eb44e..1b2f455 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.11)
-project(function2 VERSION 4.2.0 LANGUAGES CXX)
+project(function2 VERSION 4.2.3 LANGUAGES CXX)
 
 if (NOT FU2_IS_FIND_INCLUDED)
   string(COMPARE EQUAL ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_SOURCE_DIR}
@@ -36,6 +36,8 @@ target_compile_features(function2
     cxx_trailing_return_types
     cxx_return_type_deduction)
 
+install(DIRECTORY "include/function2" TYPE INCLUDE)
+
 if (FU2_IS_TOP_LEVEL_PROJECT)
   include(ExternalProject)
   include(GNUInstallDirs)
@@ -43,8 +45,6 @@ if (FU2_IS_TOP_LEVEL_PROJECT)
 
   # Create an install target:
   # Headers and license files
-  install(DIRECTORY "${PROJECT_SOURCE_DIR}/include/function2"
-          DESTINATION "include")
   install(FILES "LICENSE.txt" DESTINATION .)
   install(FILES "Readme.md" DESTINATION .)
 
diff --git a/include/function2/function2.hpp b/include/function2/function2.hpp
index ffb82b5..d84ea2d 100644
--- a/include/function2/function2.hpp
+++ b/include/function2/function2.hpp
@@ -1408,7 +1408,12 @@ struct accepts_all<
     void_t<std::enable_if_t<accepts_one<T, Signatures>::value>...>>
     : std::true_type {};
 
-#if defined(FU2_HAS_NO_EMPTY_PROPAGATION)
+#if defined(__OBJC__)
+/// In Objective C lambdas can be implicitly converted to block pointers,
+/// thus causing the copy constructor to be invoked.
+template <typename T>
+struct use_bool_op : std::false_type {};
+#elif defined(FU2_HAS_NO_EMPTY_PROPAGATION)
 template <typename T>
 struct use_bool_op : std::false_type {};
 #elif defined(FU2_HAS_LIMITED_EMPTY_PROPAGATION)