gEDA-dev: Guile 1.6 compat patch breaks gnetlist build

[Peter Clifton]

On Thu, 2007-08-02 at 20:00 +0100, Peter TB Brett wrote:
> Hi folks,
> 
> c31bd4adb677d671af8bdf5aed71f96a4995f9b1 won't build on my system.  
> Compilation log attached.
>
>   $ guile --version
>   Guile 1.8.1

Peter C smacks forehead against wall and re-writes the configure tests
_properly_.

As some of the functions we test for are macros, the simplest way to do
this (aside from just testing for guile 1.6.x), is to use AC_CHECK_DECL
with the argument of [#include <libguile.h>].

I'll push the fix shortly.

Regards

Peter C.