add TARGET_INCLUDE_DIRECTORIES to the Calyp library

lib/CMakeLists.txt

@@ -75,6 +75,12 @@ TARGET_LINK_LIBRARIES( ${PROJECT_LIBRARY}
     ${OpenCV_LIBRARIES}
 )
 
+TARGET_INCLUDE_DIRECTORIES(${PROJECT_LIBRARY}
+    PUBLIC
+        $<INSTALL_INTERFACE:include>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/..>
+)
+
 SET_TARGET_PROPERTIES( ${PROJECT_LIBRARY}
    PROPERTIES VERSION ${CALYP_VERSION}
    SOVERSION ${CALYP_VERSION_MAJOR}