Hi, Today I accedentally typed hmake +RTS -K5M Big.hs instead of hmake -K5M Big.hs To my surprise, the mistake caused hmake to loop! I was using the binary nhc98-1.16 package for ix86-Linux [1]. -- Thomas H [1] ftp://ftp.cs.york.ac.uk/pub/haskell/nhc98/nhc98-1.16-ix86-Linux.tar.gz