Problem with cl and autoconf

[Patrick Pelissier]

The project is a C library which uses libtool. 
So it adds a (useless) detection of C++ and fortran.
So it tries to detect a c++ compiler: g++, c++, gpp, aCC, CC, cxx, cc++ and cl

The problem is that cl is not at all a C++ compiler on this system but 
rather Allegro CL Trial, which is interactive. As a consequence, the 
configure freezes at the following check:
checking whether we are using the GNU C++ compiler...

Follow a dump of the session and the config.log
I use: autoconf (GNU Autoconf) 2.59
Written by David J. MacKenzie and Akim Demaille.
Copyright (C) 2003 Free Software Foundation, Inc.

How to solve this problem?

Sincerely,
  Patrick Pelissier

checking whether ln -s works... yes
checking how to recognise dependent libraries... pass_all
checking dlfcn.h usability... yes
checking dlfcn.h presence... yes
checking for dlfcn.h... yes
checking for g++... no
checking for c++... no
checking for gpp... no
checking for aCC... no
checking for CC... no
checking for cxx... no
checking for cc++... no
checking for cl... cl
checking whether we are using the GNU C++ compiler...
Suspended
address@hidden ~]$ cl --help
Loading /misc/i686/acl-5.0/libacl503.so.
Mapping /misc/i686/acl-5.0/lisp.dxl...done.
Mapping /misc/i686/acl-5.0/acl503.epll.
Allegro CL Trial Edition 5.0 [Linux/X86] (8/29/98 10:57)
Copyright (C) 1985-1998, Franz Inc., Berkeley, CA, USA.  All Rights Reser=
ved.
Warning: Unknown command-line option "--help"
;; Optimization settings: safety 1, space 1, speed 1, debug 2.
;; For a complete description of all compiler switches given the
;; current optimization settings evaluate (EXPLAIN-COMPILER-SETTINGS).
USER(1):
USER(1):
USER(1): q
Error: Attempt to take the value of the unbound variable `Q'.
  [condition type: UNBOUND-VARIABLE]
Restart actions (select using :continue):
 0: Try evaluating Q again.
 1: Set the symbol-value of Q and use its value.
 2: Use a value without setting Q.
 3: Return to Top Level (an "abort" restart)
[1] USER(2): :pop
USER(2): EOF
Really exit lisp [n]? y
; Exiting Lisp
address@hidden ~]$ cl --help
Loading /misc/i686/acl-5.0/libacl503.so.
Mapping /misc/i686/acl-5.0/lisp.dxl...done.
Mapping /misc/i686/acl-5.0/acl503.epll.
Allegro CL Trial Edition 5.0 [Linux/X86] (8/29/98 10:57)
Copyright (C) 1985-1998, Franz Inc., Berkeley, CA, USA.  All Rights Reser=
ved.
Warning: Unknown command-line option "--help"
;; Optimization settings: safety 1, space 1, speed 1, debug 2.
;; For a complete description of all compiler switches given the
;; current optimization settings evaluate (EXPLAIN-COMPILER-SETTINGS).
USER(1): EOF
Really exit lisp [n]?
USER(1): EOF
Really exit lisp [n]?
USER(1): EOF
Really exit lisp [n]? y
; Exiting Lisp

config.log
Description: Text document