I was writing the Segfaults while buiding emacs-23.1.97, 23.2 in my diary as:
05/05 pretest 23.1.97 on NetBSD/amd64 (STABLE_5.0)
05/12 editor/emacs (23.2) segfaults
05/13 without pkgsrc, it also segfaults,
05/13 Segfaults at generating lisp/cus-load.el (+combination test)
05/14 now by-passing cus-load.el

I have one extra line to find where the segfault point is:

$NetBSD$
--- work/emacs-23.2/lisp/cus-dep.el~	2010-04-04 07:26:07.000000000 +0900
+++ lisp/cus-dep.el	2010-05-20 02:22:19.000000000 +0900
@@ -59,6 +59,7 @@
             (unless (or (string-match custom-dependencies-no-scan-regexp file)
                         (string-match preloaded file)
                         (not (file-exists-p file)))
+	      (message file)
               (erase-buffer)
               (insert-file-contents file)
               (goto-char (point-min))

But now it completes without segfaults. Is it good to me or bad ?