Hi all!. I modified build.mk in order to allow Ticky-Ticky profiling (GhcLibWays=t). Now, when I try to make I get this error: ------------------------------------------------------------------------ == make way=t all; PWD = (the_whole_path)/ghc-6.6.1/rts ------------------------------------------------------------------------ ../compiler/ghc-inplace -H32m -O -fasm -W -fno-warn-unused-matches -fwarn-unused-imports -optc-O2 -static -I. -#include HCIncludes.h -fvia-C -dcmm-lint -hisuf t_hi -hcsuf t_hc -osuf t_o -ticky -#include posix/Itimer.h -c PrimOps.cmm -o PrimOps.t_o ghc-6.6.1: panic! (the 'impossible' happened) (GHC version 6.6.1 for i386-unknown-linux): ToDo: tickyAllocThunk Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug Any clue? Thanks in advance. Cristian Perfumo.