cmake: minor adjustement for export of the project

CMakeLists.txt

@@ -124,7 +124,14 @@ SET(${PROJECT_NAME}_SOURCES
 )
 
 ADD_LIBRARY(${PROJECT_NAME} SHARED ${${PROJECT_NAME}_SOURCES} ${${PROJECT_NAME}_HEADERS})
-TARGET_INCLUDE_DIRECTORIES(${PROJECT_NAME} SYSTEM PUBLIC ${Boost_INCLUDE_DIRS} ${EIGEN3_INCLUDE_DIRS} ${PYTHON_INCLUDE_DIRS} ${NUMPY_INCLUDE_DIRS})
+TARGET_INCLUDE_DIRECTORIES(${PROJECT_NAME} 
+  SYSTEM PUBLIC 
+  ${Boost_INCLUDE_DIRS} 
+  ${EIGEN3_INCLUDE_DIRS} 
+  ${PYTHON_INCLUDE_DIRS} 
+  ${NUMPY_INCLUDE_DIRS}
+  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
+
 IF(NOT WIN32)
   TARGET_COMPILE_OPTIONS(${PROJECT_NAME} PRIVATE $<$<CXX_COMPILER_ID:MSVC>:-bigobj> "-Wno-conversion")
 ELSE()

python/CMakeLists.txt

@@ -39,13 +39,13 @@ ELSE()
   SET(${PYWRAP}_INSTALL_DIR ${CMAKE_INSTALL_PREFIX}/${PYTHON_SITELIB}/${PROJECT_NAME})
 ENDIF()
 
-SET_TARGET_PROPERTIES(${PYWRAP} PROPERTIES SUFFIX ${PYTHON_EXT_SUFFIX})
-
-SET_TARGET_PROPERTIES(${PYWRAP} PROPERTIES
-  LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}")
-
-SET_TARGET_PROPERTIES(${PYWRAP} PROPERTIES PREFIX "")
-SET_TARGET_PROPERTIES(${PYWRAP} PROPERTIES OUTPUT_NAME "${PROJECT_NAME}")
+SET_TARGET_PROPERTIES(${PYWRAP}
+  PROPERTIES 
+  PREFIX ""
+  SUFFIX ${PYTHON_EXT_SUFFIX}
+  OUTPUT_NAME "${PROJECT_NAME}"
+  LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}"
+  )
 
 INSTALL(TARGETS ${PYWRAP} DESTINATION ${${PYWRAP}_INSTALL_DIR})