GDC 5.1.0 fails building.

[Jens Bauer via D.gnu]

I just started building GDC-5, so I figured I'd use GCC-5.1.0 
(for easy transition from 4.9).

It turns out that GDC-5 will not build; the file ...

gcc/d/d-lang.cc

... fails on this line ...

3c59416a gcc/d/d-lang.cc 2016-10-29 00:51:04 +0200 1517)
        debug_hooks->register_main_translation_unit 
(global_context);

... because register_main_translation_unit is not a member of 
gcc_debug_hooks.
I've found out that this member was first seen in GCC-5.2.0.

Note: I'm now attempting to build GDC-5.2.0.