naskeag % uname -a
Linux naskeag 2.6.15-gentoo-r7 #4 SMP Thu Mar 16 15:33:42 PST 2006
x86_64 Dual Core AMD Opteron(tm) Processor 275 AuthenticAMD GNU/Linux
naskeag % unzip -q openjdk-7-ea-src-b12-24_apr_2007.zip
naskeag % cd openjdk             
naskeag % ls
LICENSE             README.html         control/  j2se/
README-builds.html  THIRD_PARTY_README  hotspot/
naskeag % head LICENSE 
The GNU General Public License (GPL)

Version 2, June 1991

Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

naskeag % cd control/make
naskeag % time make ALT_BOOTDIR=/opt/sun-jdk-1.6.0 \
> ALT_CLOSED_JDK_IMPORT_PATH=/w/tmp/jdk1.7.0 >&log
real    23m1.273s
user    25m40.176s
sys     3m1.175s
naskeag % ../build/linux-amd64/bin/java -version
openjdk version "1.7.0-internal"
OpenJDK Runtime Environment (build 1.7.0-internal-mr_27_apr_2007_15_57-b00)
OpenJDK 64-Bit Server VM (build 1.7.0-internal-mr_27_apr_2007_15_57-b00, mixed mode)
naskeag %