What are these lines for in iBase.h/iMesh.h... #ifndef ITAPS #define ITAPS #endif I don't see any conditional logic that depends on this symbol. Mark -- Mark C. Miller, Lawrence Livermore National Laboratory email: mailto:miller86 at llnl.gov (M/T/W) (925)-423-5901 (!!LLNL BUSINESS ONLY!!) (Th/F) (530)-753-8511 (!!LLNL BUSINESS ONLY!!)