diff --git a/CMakeLists.txt b/CMakeLists.txt
index d4db47b..afe7c67 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,6 +5,12 @@ project(fn)
 set(fn_VERSION_MAJOR 1)
 set(fn_VERSION_MINOR 0)
 
+add_library(${PROJECT_NAME} INTERFACE)
+target_include_directories(
+    ${PROJECT_NAME}
+    INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+              $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
 
 set(CMAKE_CXX_FLAGS_DEBUG   "${CMAKE_CXX_FLAGS} -O0 -ggdb3 -DDEBUG")
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O2")