1) You may want to adjust the "Optional languages"
section of the Makefile before building this package.
2) The Ada compiler front-end of gcc is itself written
in Ada. Consequently, an Ada compiler must be used
to build it.
Note however that in pkgsrc the lang/gcc-aux and/or
lang/gnat-aux packages, which are substantially newer,
are recommended instead of building the gcc34 Ada
frontend.
If you do wish to build the Ada compiler as part of this
package you can download a pre-built version of gcc 3.4.0
Ada for bootstrapping from:
http://www.johnrshannon.com/NetBSD/ix86/gccAda-3.4.0.tgz
http://www.johnrshannon.com/NetBSD/pentium4/gccAda-3.4.0.tgz
http://www.johnrshannon.com/NetBSD/x86_64/gccAda-3.4.0.tgz
The first two pkgs were built on NetBSD 2.0-BETA. The AMD64
pkg was built under NetBSD 1.6ZL.