diff --git a/3rdparty/CMakeLists.txt b/3rdparty/CMakeLists.txt
index 4511e43..dca4bd7 100644
--- a/3rdparty/CMakeLists.txt
+++ b/3rdparty/CMakeLists.txt
@@ -1,6 +1,11 @@
+list (APPEND thirdparty_src)
+list (APPEND thirdparty_lib)
+list (APPEND thirdparty_inc)
+list (APPEND thirdparty_def)
+
 add_subdirectory(everest)
 
-set(src_thirdparty
-  ${src_everest}
-  PARENT_SCOPE
-)
+set(thirdparty_src ${thirdparty_src} PARENT_SCOPE)
+set(thirdparty_lib ${thirdparty_lib} PARENT_SCOPE)
+set(thirdparty_inc ${thirdparty_inc} PARENT_SCOPE)
+set(thirdparty_def ${thirdparty_def} PARENT_SCOPE)