--- src/openms/CMakeLists.txt	2015-04-21 04:57:19.000000000 -0500
+++ src/openms/CMakeLists.txt	2015-05-28 18:33:59.809851316 -0500
@@ -87,7 +87,8 @@
                           ${WM5_LIBRARIES}
                           ${BZIP2_LIBRARIES}
                           ${ZLIB_LIBRARIES}
-                          ${GLPK_LIBRARIES})
+                          ${GLPK_LIBRARIES}
+                          -lrt -lGL)
 
 # xerces requires linking against CoreFoundation&CoreServices
 if(APPLE)