guile-www configure script cannot find srfi

[Carson Chittom <carson%sdf.lonestar.org@localhost>]

While playing on my iMac (using OS X 10.3.9), I decided to ditch Fink 
and give pkgsrc (pkgsrc-2006Q4, downloaded the tarball and am 
currently running a cvs update just in case) a whirl, since I already 
had a spare UFS partition set up.  I'm trying to install 
finance/gnucash and everything works great until the dependency checks 
come to devel/guile-www, when the configure script reports that it 
can't find srfi and srfi-13.  A Google search tells me that srfi is 
part of guile, which pkg_info says is installed, so I dig around on my 
system and find srfi-13.h (and -14.h and -4.h) in 
/usr/pkg/include/guile/srfi.  I'm sure there's some way to tell it 
where to find srfi, but ./configure --help wasn't very helpful, and I 
didn't find anything either in a quick scan of the pkgsrc 
documentation.  Can someone point me in the right direction?

Regards,
Carson