[plt-scheme] can't configure since new libtool (1.3 -> 1.5)

Hello,

I install plt-scheme on FreeBSD 5.4, and have never had a problem until now. A 
couple of weeks ago, the FreeBSD ports upgraded libtool, and it is now 
libtool version 1.5, up from 1.3.

When I run:

# ./configure --prefix=/usr/local/plt --enable-shared --enable-cairo=false        

I get the following error:

checking for strip... strip
ltconfig: you must specify a LTMAIN file
Try `ltconfig --help' for more information.
configure: error: libtool configure failed
configure: error: /usr/local/bin/bash './configure' failed for 
foreign/gcc/libffi


-FreeBSD 5.4 p12
-libtool 1.5.22_2 
-plt-300-src-unix.tgz


Thanks for any help/info!

-DW