Hello, When I built a program on AIX using network code, I got the following errors during the link stage: /usr/local/lib/ghc-6.2.1/libHSnetwork.a(ancilData.o)(.pr+0x31c):cbits/ancilData.c: undefined reference to `.CMSG_LEN' /usr/local/lib/ghc-6.2.1/libHSnetwork.a(ancilData.o)(.pr+0x3fc):cbits/ancilData.c: undefined reference to `.CMSG_SPACE' /usr/local/lib/ghc-6.2.1/libHSnetwork.a(ancilData.o)(.pr+0x420):cbits/ancilData.c: undefined reference to `.CMSG_LEN' (repeated over and over) I traced the problem down to ancilData.c. The attached trivial patch is a workaround. AIX does not define CMSG_LEN or CMSG_SPACE anywhere -- unless you #define _LINUX_SOURCE_COMPAT before #including sys/socket.h. (sounds ugly.) Here's how AIX defines msghdr, BTW: #if defined(COMPAT_43) && !defined(_KERNEL) struct msghdr { caddr_t msg_name; /* optional address */ int msg_namelen; /* size of address */ struct iovec *msg_iov; /* scatter/gather array */ int msg_iovlen; /* # elements in msg_iov */ caddr_t msg_accrights; /* access rights sent/received */ int msg_accrightslen; }; #else struct msghdr { void *msg_name; /* optional address */ socklen_t msg_namelen; /* size of address */ struct iovec *msg_iov; /* scatter/gather array */ int msg_iovlen; /* # elements in msg_iov */ void *msg_control; /* ancillary data, see below */ socklen_t msg_controllen; /* ancillary data buffer len */ int msg_flags; /* flags on received message */ }; #endif My little hack tells it to use COMPAT_43. I suppose you could also go the _LINUX_SOURCE_COMPAT route. In either case, I am not proficient at all with the autotools stuff and lack the expertise to craft the correct build stuff there, but I'm happy to give you whatever information you may need to do that.
