Newbie getting involved - compile error

[Jason Schroeder]

I have followed the directions, and here is the relevant history.
Is this a legitimate build error?  Or do the instructions need to be improved?

hg clone http://hg.openjdk.java.net/jdk7/tl mytl
cd mytl/
sh ./get_source.sh
ALT_BOOTDIR=/usr/lib/jvm/java-6-openjdk . ./jdk/make/jdk_generic_profile.sh
ALT_BOOTDIR=/usr/lib/jvm/java-6-openjdk make sanity

<install stuff>

ALT_BOOTDIR=/usr/lib/jvm/java-6-openjdk make all

<snip>

BUILD FAILED
/home/shrode/jdk7/mytl/jaxp/build-defs.xml:70: ERROR: Cannot find
source for project jaxp.

HINT: Try setting drops.dir to indicate where the bundles can be
found, or try setting the ant property allow.downloads=true to
download the bundle from the URL.
e.g. ant -Dallow.downloads=true -OR- ant -Ddrops.dir=some_directory