diff --git a/src/osgPlugins/curl/CMakeLists.txt b/src/osgPlugins/curl/CMakeLists.txt
index a65ec32f2..f20ea6284 100644
--- a/src/osgPlugins/curl/CMakeLists.txt
+++ b/src/osgPlugins/curl/CMakeLists.txt
@@ -21,10 +21,13 @@ SET(TARGET_H
     ReaderWriterCURL.h
 )
 
-IF(ZLIB_FOUND)
-    SET(TARGET_EXTERNAL_LIBRARIES ${CURL_LIBRARY} ${ZLIB_LIBRARY})
+IF(ZLIB_FOUND)   
+    SET(TARGET_LIBRARIES_VARS
+        CURL_LIBRARY
+        ZLIB_LIBRARY)
 ELSE()
-    SET(TARGET_EXTERNAL_LIBRARIES ${CURL_LIBRARY})
+    SET(TARGET_LIBRARIES_VARS
+        CURL_LIBRARY)
 ENDIF()
 
 IF(WIN32 OR MINGW)