diff --git a/CMakeLists.txt b/CMakeLists.txt
index 013cbaf..e461fcd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,9 @@
 # Distributed under the Boost Software License, Version 1.0.
 # See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt
 
+# We support CMake 3.5, but prefer 3.16 policies and behavior
 cmake_minimum_required(VERSION 3.5...3.16)
+
 project(boost_static_assert VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
 
 add_library(boost_static_assert INTERFACE)
@@ -16,11 +18,13 @@ target_link_libraries(boost_static_assert
         Boost::config
 )
 
-include(BoostInstall OPTIONAL RESULT_VARIABLE HAVE_BOOST_INSTALL)
+# boost_install requires PROJECT_VERSION
+# Without the superproject, we don't have any, so skip installation
 
-if(HAVE_BOOST_INSTALL)
+if(BOOST_SUPERPROJECT_VERSION)
 
-    boost_install(TARGETS boost_static_assert HEADER_DIRECTORY include/)
+  include(BoostInstall)
+  boost_install(TARGETS boost_static_assert HEADER_DIRECTORY include/)
 
 endif()