🚀 go-pugleaf

I'm using FreeBSD 2.1R on a Pentium system, and have been having
the worst time trying to compile flex (which I need to compile
postgres95).  Normally I just run the 'configure' utility, which
always works well.  This time, however, I just get a long error
message:


/usr/ports/devel/flex/work/flex-2.5.3 >./configure
.
..
README
NEWS
COPYING
INSTALL
FlexLexer.h
configure.in
conf.in
Makefile.in
mkskel.sh
flex.skl
flexdef.h
version.h
ccl.c
dfa.c
ecs.c
gen.c
main.c
misc.c
nfa.c
parse.y
scan.l
skel.c
sym.c
tblcmp.c
yylex.c
libmain.c
libyywrap.c
MISC
flex.1
install.sh
mkinstalldirs
configure
config.log
confdefs.h
configure: error: missing argument to --


This is for flex 2.5.3.  As I say, I've run configure many times
before, and never had a problem.  Has something changed recently?
Are there any path dependencies or anything that I might be
tripping over?

(For those of you who use FreeBSD: this error was actually generated
by the FreeBSD ports version of flex -- and those FreeBSD ports
have always worked flawlessly in the past.)

Any help would be greatly appreciated.

-David.