I moved from 1.6 to current partly because the Ada compiler
needs native pthreads support.
I went in /usr/pkgsrc/lang/gcc34 and edited the Makefile in order
to have Ada support.
Also, I followed the instructions in the README and downloaded
a pre-built version of gcc 3.4.0 Ada (needed for bootstrapping).
After several hours, make ends up with an error due the missing
target gnatlib_and_tools.

Did somebody succeed in installing an Ada compiler under NetBSD?
How?

Regards,
Thierry Lacoste.