Build Failure on Master

[Pepper Lebeck-Jobe]

I decided to try and figure out where the empty source path regression was
coming from, and possibly fix it. See:
http://mail.openjdk.java.net/pipermail/jigsaw-dev/2017-June/012938.html

But, when I checked out the sources from mercurial and tried to build them,
I ended up getting some errors. Anyone know whether I should be suspecting
my development environment or the actual code?

Here's what I did based on these instructions.
http://hg.openjdk.java.net/jdk9/jdk9/file/023f93e511ba/common/doc/building.md

$>  hg clone http://hg.openjdk.java.net/jdk9/jdk9 openJDK
$> cd openJDK
$> bash ./get_source.sh
$> bash ./configure --with-boot-jdk=$JAVA_HOME
Output here:
https://drive.google.com/file/d/0Byp8Kl9b7wdibzk2TEFzN3ExVXc/view
$> make clean
$> make all LOG=debug
Output here:
https://drive.google.com/file/d/0Byp8Kl9b7wdiSEpVeHNjSDBIZTA/view

Any help is appreciated. I *think* I have installed the prerequisites
according to the instructions although my version of XCode (8.3.3) is
considerably newer. It wasn't clear of XCode 6.3 was a minimum requirement
or an exact requirement.

Thanks,
Pepper