[Buildroot] adding libgphoto2

[Niall Parker <stuff@pender.dnsalias.net>]

Hello,

I've been using buildroot 2011.02 and was trying to libgphoto2 and was 
following the howto in the docs (also copying the libusb Config.in and 
.mk with tweaks). Unfortunately it wasn't a trivial task and it is 
complaining it needs libltdl ...

> checking dynamic linker characteristics... GNU/Linux ld.so
> checking how to hardcode library paths into programs... immediate
> checking ltdl.h usability... no
> checking ltdl.h presence... no
> checking for ltdl.h... no
> checking that we can compile and link with libltdl... no
> configure: error: cannot compile and link against libltdl
> libgphoto2 requires libltdl (the libtool dl* library),
> but cannot compile and link against it.
> Aborting.

I have enabled libtool in the package selection but evidently the 
autoconf isn't finding it. Any suggestions on where to start ?

Thanks.

                         ... Niall