build farm failure tuna on OSX 10.4 for 8.0

It appears to be getting the wrong address for tsearch()

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x0000011b
0x9009a7c8 in tsearch ()

However if I set a break point for tsearch, I get

br tsearch
Breakpoint 5 at 0xe08c64: file txtidx.c, line 533.

further

(gdb) display *finfo
5: *finfo = {
fn_addr = 0x9009a798 <tsearch>,
fn_oid = 377912,
fn_nargs = 0,
fn_strict = 0 '\0',
fn_retset = 0 '\0',
fn_extra = 0x0,
fn_mcxt = 0x20270f4,
fn_expr = 0x0
}
(gdb) list *0x9009a798
No source file for address 0x9009a798.

I admit to not being an expert in gdb here, but it certainly looks
like something isn't quite right

Dave