Hi, If you want to build GHC in different ways, eg. with ticky-ticky profiling on, you can do it by setting "GhcLibWays=t". This make two versions of all the library .o files and .a files, a normal one, and a ticky-ticky one. My question is: can you stop it from making the normal one? Thanks for the help. -- Nick Nethercote njn25@cam.ac.uk