dlang.org makefile pains

[Jakob Ovrum via Digitalmars-d]

On Tuesday, 15 March 2016 at 11:15:12 UTC, Jakob Ovrum wrote:
> All I want to do is test DDox with local dlang.org changes and 
> local Phobos changes.

Now I'm hitting an old issue again - whether using the default 
make target or apidocs-serve, DDox doesn't seem to generate 
updated docs when I make changes in Phobos after the first build, 
while the DDoc output *does* update.

i.e. make root/dlang.org with default target, edit root/phobos in 
a way that changes generated documentation, then make the docs 
again. root/dlang.org/web/phobos-prerelease/ will be updated but 
root/dlang.org/web/library-prerelease/ will remain unchanged from 
the first build.

It works when rebuilding after make clean, which of course takes 
a significant amount of time.