Improve install include directory layout

CMakeLists.txt

@@ -43,7 +43,7 @@ add_library (
 add_library (${PROJECT_NAME}::${PROJECT_NAME} ALIAS ${PROJECT_NAME})
 
 target_include_directories (
-	${PROJECT_NAME} PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> $<INSTALL_INTERFACE:INCLUDE_PATH>
+	${PROJECT_NAME} PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> $<INSTALL_INTERFACE:INCLUDE_PATH/ITASampler>
 )
 
 target_link_libraries (${PROJECT_NAME} PRIVATE ITABase::ITABase ITADataSources::ITADataSources)
@@ -63,7 +63,7 @@ packageProject (
 	VERSION ${PROJECT_VERSION}
 	BINARY_DIR ${PROJECT_BINARY_DIR}
 	INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include
-	INCLUDE_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+	INCLUDE_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ITASampler
 	DEPENDENCIES "ITABase;ITADataSources"
 	COMPATIBILITY ExactVersion
 	NAMESPACE ${PROJECT_NAME}