Hi all, With ghc 5.04.2 I'm having some trouble linking (debian linux). Here's the error I get: /home/bjpop/woo/lib/buddha-0.5/libbuddha_p.a(Partial.o): In function `s1jZ_fast1': Partial.o(.text+0xa44): undefined reference to `GHCziPrim_zdwZ2H_entry' This is repeated about 4 times for different locations, but the same symbol. Unfortunately I can't repeat the problem in a small program. So instead, I'll point out the things I know, in case any of them help. 1) libbuddha_p.a is a library built from a number of modules. Each of these modules is compiled with: -O -cpp -prof -fglasgow-exts -package lang -package-name buddha 2) The problem occurs when I try to use an unboxed tuple in one of the modules: newtype Comp a = C (CompState -> (# a, CompState #)) If I remove the unboxing, the linking problem disappears 3) removing the -prof flag doesn't seem to fix anything 4) compiling without -O fixes the problem I'm sorry I can't be clearer than this. I'm hoping someone understands what that symbol means, which might help to understand the problem. My suspicion is that it is something to do with inter-module optimisations and the boxed tuple, but of course I'm only guessing. Cheers, Bernie.