diff -urN levmar-2.6.old/CMakeLists.txt levmar-2.6/CMakeLists.txt
--- levmar-2.6.old/CMakeLists.txt	2014-08-07 18:22:25.739008113 +0200
+++ levmar-2.6/CMakeLists.txt	2014-08-07 18:22:36.050014845 +0200
@@ -67,7 +67,7 @@
 
 # demo program
 IF(BUILD_DEMO)
-  SET(LIBS levmar)
+  SET(LIBS levmar m)
 
   LINK_DIRECTORIES(${CMAKE_BINARY_DIR}) # location of the levmar library
   LINK_DIRECTORIES(${LAPACKBLAS_DIR})