Transient compilations on CVS code

Hi: I'm a newbie on using CVS but some time ago I decided to compile against the code on the CVS repository. I'm interested on 6.3 version. Recently I found this problem, after making autoheader,autoconf: ghc/include: make boot mkDerivedConstants.c:34 'StgTickyInfo' undeclared (first use of this function) is this a transient problem to be solved or I'm doing something wrong ? And three weeks ago, on the configure script, I was asked to download the alex tool, when on older versions (from tar.gz) this was not necessary ... Thanks...