gEDA-dev: problems building latest gaf

[Ales Hvezda]

Hi PeterB,

[snip]
>How about we use a custom m4 macro:
>
>define([gEDA_m4_check_macro], [ifdef([$1], , [m4_fatal([m4 macro `$1' is no=
>t=20
>defined.  Ensure that `$2' is installed in your aclocal search path.],=20
>[1])])])
>

	I like this approach.  Catches missing macros and the lack
of -devel packages really early for those users who are building from
the repository.  Tarball users aren't affected by the lack of a macro.

	I tried your macro and m4 wasn't to happy with the empty success
string for the ifdef, so I added a nop there.  Here's what I came up with
starting with your above macro:

AC_DEFUN([AC_GEDA_MACRO_CHECK],
[
  ifdef(  [$1],
          true,   dnl NOP
          [
            AC_FATAL(
                      [m4 macro `$1' is not defined.  Ensure that `$2' is installed in your aclocal search path.],
                    )
          ]
       )
])

The indentation is for my sanity. :)  Any additional thoughts or comments on
this macro?  I am planning on putting this macro into libgeda/acinclude.m4
only (and only use the macro in libgeda), since that is the first thing
people should build and that better darn work.

I also need to update the autogen.sh scripts to look at exit status and
do the right thing as they currently do not.

-Ales