lang/guile build fails for me

[Christoph Moench-Tegeder]

## Andriy Gapon (avg at FreeBSD.org):

> It also fails for me on stable/8 with base gcc as ports compiler, but in a
> different fashion at configure step:
> checking for lt_dlinit in -lltdl... no
> configure: error: libltdl not found.  See README.
> ===>  Script "configure" failed unexpectedly.
> 
> >From config.log:
> configure:11579: checking for lt_dlinit in -lltdl
> configure:11604: cc -o conftest -O2 -pipe -O2 -fno-strict-aliasing -pipe
> -march=nocona -I/usr/local/include  -rpath=/usr/lib:/usr/local/lib conftest.c
> -lltdl   >&5
> /usr/bin/ld: cannot find -lltdl

Confirmed (8.2-RELEASE-p2).
Somehow, configure loses $LD_LIBRARY_PATH. Not sure how...

Regards,
Christoph

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