Correct __FreeBSD_version to use?

[b. f.]

>My question is what __FreeBSD_version number should I use
>to have gdb working on FreeBSD 8.0 or greater?

The earliest FreeBSD version bump after Revision 190620, Wed Apr 1
13:09:26 2009 UTC, seems to have been in Revision 190787, Mon Apr 6
22:29:41 2009 UTC, which changed the version to 800075:

http://svn.freebsd.org/viewvc/base/head/sys/sys/param.h?r1=190373&r2=190787

b.