CMake: do not assume CMAKE_INSTALL_INCLUDEDIR is include

CMakeLists.txt

@@ -83,7 +83,6 @@ else()
   endif()
 endif()
 
-
 include("${JRL_CMAKE_MODULES}/base.cmake")
 include("${JRL_CMAKE_MODULES}/ide.cmake")
 include("${JRL_CMAKE_MODULES}/apple.cmake")
@@ -331,7 +330,8 @@ add_source_group(${PROJECT_NAME}_SOURCES)
 
 add_library(${PROJECT_NAME} SHARED ${${PROJECT_NAME}_SOURCES}
                                    ${${PROJECT_NAME}_HEADERS})
-target_include_directories(${PROJECT_NAME} PUBLIC $<INSTALL_INTERFACE:include>)
+target_include_directories(
+  ${PROJECT_NAME} PUBLIC $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
 target_link_libraries(${PROJECT_NAME} PUBLIC pinocchio::pinocchio
                                              eiquadprog::eiquadprog)