diff --git a/freeglut/freeglut/CMakeLists.txt b/freeglut/freeglut/CMakeLists.txt
index 1636a23..d636bcb 100644
--- a/freeglut/freeglut/CMakeLists.txt
+++ b/freeglut/freeglut/CMakeLists.txt
@@ -173,6 +173,8 @@ INSTALL(FILES ${FREEGLUT_HEADERS} DESTINATION include/GL)
 option( FREEGLUT_BUILD_DEMOS "Build FreeGLUT demos." ON )
 
 SET(DEMO_LIBS ${OPENGL_LIBRARY} ${LIBS})
+SET(DEMO_LIBS ${LIBS} m)
+
 MACRO(ADD_DEMO name)
 	if( FREEGLUT_BUILD_DEMOS )
 		ADD_EXECUTABLE(${name} ${ARGN})