SIGSEGV shortly after (fork)

	It seems that Scheme48 (as of [1]) contains one more
	SIGSEGV-raising issue:

Welcome to Scheme 48 1.9T (made by ivan on Sun Oct 19 18:08:32 NOVST 2008)
Copyright (c) 1993-2008 by Richard Kelsey and Jonathan Rees.
Please report bugs to [email protected].
Get more information at http://www.s48.org/.
Type ,? (comma question-mark) for help.
> ,new-package 
263> ,structure foo (export) 
foo> ,open posix-processes 
foo> (cond ((fork) => (lambda (pid) pid))
	   (else      (exec "date" "+%s")))
1224414847

Process scheme segmentation fault

	(The previous version I've built [2] also happens to have the
	problem.)

	Apparently, the problem doesn't appear in 1.8:

Welcome to Scheme 48 1.8 (made by ivan on Wed Apr 16 18:18:15 NOVST 2008)
Copyright (c) 1993-2008 by Richard Kelsey and Jonathan Rees.
Please report bugs to [email protected].
Get more information at http://www.s48.org/.
Type ,? (comma question-mark) for help.
> ,new-package 
252> ,structure foo (export) 
foo> ,open posix-processes 
foo> (cond ((fork) => (lambda (pid) pid))
	   (else      (exec "date" "+%s")))
#{Process-id 30160}
foo> 1224414864
,exit

Process scheme finished

	I've built the binary as usual:

$ hg clone -r09c568f76cfc5 ... scheme48-09c568f76cfc5-1
requesting all changes
adding changesets
adding manifests
adding file changes
added 1231 changesets with 9999 changes to 1554 files
922 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd scheme48-09c568f76cfc5-1/ 
$ ACLOCAL="aclocal -I m4" autoreconf -i 
...
$ mkdir +build-0 +build-1 
$ cd +build-0/ 
$ ../configure --prefix="$HOME" 
...
$ LC_ALL=C nice -n+19 nohup /usr/bin/time make \
      ../build/filenames.make i-know-what-i-am-doing \
      c/scheme48.h ../build/initial.image-{32,64} &
...
$ cd ../+build-1/ 
$ ../configure --prefix="$HOME" 
...
$ LC_ALL=C nice -n+19 nohup /usr/bin/time make & 
...
$ 

[1] http://www.deinprogramm.de/cgi-bin/hgs48.cgi/rev/09c568f76cfc5595dc9eeb98bac9bb9847cbe8bf
[2] http://www.deinprogramm.de/cgi-bin/hgs48.cgi/rev/f6856f11c6f344204839e016e6bbf8836254f86f