diff --git a/CMakeLists.txt b/CMakeLists.txt
index a62a974..43b0d96 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -70,6 +70,7 @@ install(FILES ${LIBREXY_BUILT_LIBRARY_HEADERS} DESTINATION "${CMAKE_INSTALL_INCL
 install(DIRECTORY "include/rexy/detail" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/rexy" FILES_MATCHING PATTERN "*.hpp" PATTERN "*.tpp")
 install(DIRECTORY "include/rexy/cx" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/rexy" FILES_MATCHING PATTERN "*.hpp" PATTERN "*.tpp")
 install(DIRECTORY "include/rexy/compat" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/rexy" FILES_MATCHING PATTERN "*.hpp" PATTERN "*.tpp")
+install(DIRECTORY "include/rexy/concepts" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/rexy" FILES_MATCHING PATTERN "*.hpp" PATTERN "*.tpp")
 
 configure_file(
 	"${CMAKE_CURRENT_SOURCE_DIR}/pc/librexy.pc.cmake.in"
diff --git a/include/rexy/compat/standard.hpp b/include/rexy/compat/standard.hpp
index 0082b85..2b269b6 100644
--- a/include/rexy/compat/standard.hpp
+++ b/include/rexy/compat/standard.hpp
@@ -19,7 +19,7 @@
 #ifndef REXY_COMPAT_CPP20_HPP
 #define REXY_COMPAT_CPP20_HPP
 
-	#ifdef __cpp_consteval
+	#if __cplusplus >= 202002L
 		#define REXY_CPP20_CONSTEXPR constexpr
 		#define REXY_CPP20_CONSTEVAL consteval
 	#else //__cpp_consteval
diff --git a/include/rexy/storage_for.tpp b/include/rexy/storage_for.tpp
index 0ea755a..8e8063f 100644
--- a/include/rexy/storage_for.tpp
+++ b/include/rexy/storage_for.tpp
@@ -58,7 +58,7 @@ namespace rexy{
 		}
 	}
 	template<class T>
-	constexpr storage_for<T>::~storage_for(void)noexcept(std::is_nothrow_destructible<value_type>::value){
+	REXY_CPP20_CONSTEXPR storage_for<T>::~storage_for(void)noexcept(std::is_nothrow_destructible<value_type>::value){
 		if(m_dirty){
 			destroy();
 		}
@@ -185,7 +185,7 @@ namespace rexy{
 		m_dirty = 1;
 	}
 	template<class T>
-	constexpr storage_for<T>::~storage_for(void)noexcept(std::is_nothrow_destructible<value_type>::value){
+	REXY_CPP20_CONSTEXPR storage_for<T>::~storage_for(void)noexcept(std::is_nothrow_destructible<value_type>::value){
 		if(m_dirty){
 			destroy();
 		}