Just a heads up that cygwin 1.5.6 is released and has much better SystemV IPC, though the cygserver that actually does the work wasn't included AFAICT; and even if it was included, installing it as a service is an extra manual step that may or may not be performed. I'm going to work on a patch to skip the failing IPC::SysV tests if the server isn't actually running (AIUI the system calls will give SIGSYS in this case), and also to set d_semctl_semun and maybe d_semctl_semid_ds in cygwin hints (since the configure test will fail if the ipc server isn't running). Also, I'm going to remove the IPC::SysV hint that was using the now deprecated cygipc library. (AIUI, we didn't actually support using cygipc as it wasn't good enough, or so Jarkko's comment in the main hints/cygwin.sh has me thinking.) If anyone sees a need for supporting a choice between cygipc or cygserver, scream now. Any other comments also appreciated.