There are many posts about "...FATAL: Could not create shared memory segment. Function not implemented..." when trying initdb using cygwin, but...I get the same error with straight Linux (pgsql 7.4.1; 2.6.4-ck2 kernel). It installed fine with RH9 with either a RH2.4.20-8 or a vanilla 2.6.4 kernel, but I recently switched to Gentoo 2004.0 with the aforementioned kernel. Is this a problem with the ck patches? Might this be fixed with pgsql 7.4.2? Is there some other problem? (FWIW, I also posted this on one of the Gentoo forums and some people have looked at it but I haven't gotten any suggestions.) Thanks!