--- VTK/Utilities/vtknetcdf/CMakeLists.txt~	2012-04-02 18:57:30.000000000 +0200
+++ VTK/Utilities/vtknetcdf/CMakeLists.txt	2012-11-15 12:48:08.386680992 +0100
@@ -343,6 +343,7 @@
      TARGET_LINK_LIBRARIES(vtkNetCDF ${VTK_HDF5_LIBRARIES})
   endif()
 ENDIF (NETCDF_ENABLE_NETCDF4)
+TARGET_LINK_LIBRARIES(vtkNetCDF -lm)
 
 VTK_ADD_LIBRARY(vtkNetCDF_cxx ${netcdf_cxx_SOURCES})
 TARGET_LINK_LIBRARIES(vtkNetCDF_cxx vtkNetCDF)