diff --git a/CMakeLists.txt b/CMakeLists.txt
index 448d0af..ac528a4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,8 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
-
-if(POLICY CMP0048)
-  cmake_policy(SET CMP0048 NEW) # CMake 3.0.0
-endif()
+cmake_minimum_required(VERSION 3.5)
 
 set(MODULE_NAME "OpenIGTLinkIF")
 set(MODULE_TITLE "OpenIGTLink I/F")
@@ -10,8 +6,13 @@ set(MODULE_TITLE "OpenIGTLink I/F")
 string(TOUPPER ${MODULE_NAME} MODULE_NAME_UPPER)
 
 #-----------------------------------------------------------------------------
-find_package(Slicer REQUIRED)
-include(${Slicer_USE_FILE})
+if(Slicer_SOURCE_DIR)
+  find_package(OpenIGTLink REQUIRED)
+  include(${OpenIGTLink_USE_FILE})
+else()
+  find_package(Slicer REQUIRED)
+  include(${Slicer_USE_FILE})
+endif()
 
 # --------------------------------------------------------------------------
 # Check if version 2 protocol is available
@@ -98,7 +99,6 @@ slicerMacroBuildQtModule(
   RESOURCES ${MODULE_RESOURCES}
   )
 
-
 if(BUILD_TESTING)
   #add_subdirectory(Testing)
 endif()