guile and libtool

[Paul Emsley]

$ ./configure
[snip]
checking for lt_dlinit in -lltdl... no
configure: error: libltdl not found.  See README.

I'd like guile to have a libtool argument, say --libtool=DIR
that specifies where guile should find ltdl.  Is it inelegant to have to 
fiddle with LIBS environment variable.

Would you accept a patch?

Paul.