Hello, it seems hClose003 expected output is kind of Linux specific hence it fails on both Solaris and OpenBSD running on x86 host where I've been able to test this. Anyway, both OSes are not that sensitive to closing pipe read end as Linux seems to be. I also expect that other Unix(-like) systems will behave more like Solaris/OpenBSD and so the behavior of Linux is specific. Hence I'm proposing attached patch which moves currect stdout to new stdout-i386-unknown-linux and provide new stdout with the Solaris/OpenBSD result. I would suggest to commit this and allow it to test on FreeBSD/Darwin as this seems to be available to GHC team as builder machines... Thanks, Karel