Can't "catch exception" in gdb on OS X

[Jerry <lanceboyle@qwest.net>]

I'm on OS X 10.9.5 trying to debug a GNAT program. When I type

   catch exception

when the program is in the debugger but paused at the automatically inserted breakpoint at the first line, I get this:

    Cannot insert Ada exception catchpoints in this configuration.

gdb reports this:

    GNU gdb (GDB) 7.7 for GNAT GPL 2014 (20140405)
      .
      .
      .
    This GDB was configured as "x86_64-apple-darwin12.5.0".

Also (curse the line wraps),

(gdb) show configuration
This GDB was configured as follows:
   configure --host=x86_64-apple-darwin12.5.0 --target=x86_64-apple-darwin12.5.0
             --with-auto-load-dir=:${prefix}/share/auto-load
             --with-auto-load-safe-path=:${prefix}/share/auto-load
             --with-expat
             --with-gdb-datadir=/gnatmail/sandbox/gpl-2014/x86_64-darwin/gdb/pkg/share/gdb-7.7 (relocatable)
             --with-jit-reader-dir=/gnatmail/sandbox/gpl-2014/x86_64-darwin/gdb/pkg/lib/gdb (relocatable)
             --without-libunwind-ia64
             --without-lzma
             --with-python=/gnatmail/sandbox/gpl-2014/x86_64-darwin/gdb/pkg/share/gdb-7.7/python-2.7.3 (relocatable)
             --with-separate-debug-dir=/usr/lib/debug
             --without-zlib
             --without-babeltrace


Ideas?
Jerry