diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5aa640b7..d1034aad 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -94,12 +94,14 @@ if (UNIX AND NOT APPLE)
     endif() 
 
     find_library(RT_LIBRARY rt)
+    mark_as_advanced(RT_LIBRARY)
     if (RT_LIBRARY)
         list(APPEND GLFW_LIBRARIES ${RT_LIBRARY})
         set(GLFW_PKGLIBS "${GLFW_PKGLIBS} rt")
     endif()
 
     find_library(MATH_LIBRARY m)
+    mark_as_advanced(MATH_LIBRARY)
     if (MATH_LIBRARY)
         list(APPEND GLFW_LIBRARIES ${MATH_LIBRARY})
         set(GLFW_PKGLIBS "${GLFW_PKGLIBS} m")