Simon, Thanks. I think I've got the right sources. 288 export CVSROOT=:pserver:anoncvs@glass.cse.ogi.edu:/cvs 290 cvs login 334 cvs checkout -rghc-5-02-branch fpconfig 335 cd fptools/ 336 cvs checkout -rghc-5-02-branch ghc 337 cvs checkout -rghc-5-02-branch hslibs 338 ls 339 cd hslibs/ 340 ls 341 cd net/ 342 ls 343 cvs stat -v SocketPrim.hsc =================================================================== File: SocketPrim.hsc Status: Up-to-date Working revision: 1.12.2.5 Repository revision: 1.12.2.5 /cvs/fptools/hslibs/net/Attic/SocketPrim.hsc,v Sticky Tag: ghc-5-02-branch (branch: 1.12.2) Sticky Date: (none) Sticky Options: (none) Existing Tags: ghc-5-02-galois-branch (branch: 1.12.2.5.2) ghc-5-02-3 (revision: 1.12.2.5) ghc-ndp2-updated-from-trunk1 (revision: 1.21) ghc-ndp2-trunk-merge-frontier (revision: 1.21) ghc-ndp-branch2 (branch: 1.21.4) before-ghc-ndp2 (revision: 1.21) ghc-ndp-branch-merge1 (revision: 1.16) ghc-newer-usagesp-aftermerge (revision: 1.21) before-newer-usagesp-mergedto (revision: 1.21) ghc-newer-usagesp-beforemerge (revision: 1.21) ghc-newer-usagesp-branch (branch: 1.21.2) before-newer-usagesp (revision: 1.21) ghc-5-02-2 (revision: 1.12.2.4) hugs-Dec2001 (revision: 1.20) ghc-ndp-branch (branch: 1.16.2) before-ghc-ndp (revision: 1.16) ghc-5-02-1 (revision: 1.12.2.2) ghc-5-02 (revision: 1.12.2.1) ghc-5-02-branch (branch: 1.12.2) new-libraries-last-merged (revision: 1.11) However, I'm still confused. If I look at http://cvs.haskell.org/cgi-bin/cvsweb.cgi/fptools/libraries/network/Network/... then it although it has a different name it says it's the same thing and I couldn't find anything called SocketPrim.hsc. I think from what you said in one of your previous emails that I need to build the whole of ghc. Am I correct? If so I think I follow the instructions in the building guide unless there is some other documentation you think I should look at? Dominic.