We have a VHDL design using LDV51 and it work well. We just change to IUS55 and each time we compile ncvhdl we have following message ncvhdl_p: *F,DLUNNE: Can't find STANDARD at /software/linux/ius55/tools/inca/files/STD we compile the STD package using the cadence install script and it report no error. If I use ncvhdl in IUS55 with library from ldv51, it will report same messages Any idea where I have to look.