kiwi-build failed

russellh@prescott:~/rtems/work/scripts$ ./kiwi-build.sh
RTEMS Source Builder GIT ...
Already up-to-date.
RTEMS Kernel GIT ...
Cloning into 'rtems.git'...
remote: Counting objects: 509538, done.
remote: Compressing objects: 100% (94087/94087), done.
remote: Total 509538 (delta 410719), reused 501244 (delta 404316)
Receiving objects: 100% (509538/509538), 73.78 MiB | 775.00 KiB/s, done.
Resolving deltas: 100% (410719/410719), done.
Checking connectivity... done.
RTEMS LibBSD GIT ...
Cloning into 'rtems-libbsd.git'...
remote: Counting objects: 22547, done.
remote: Compressing objects: 100% (14520/14520), done.
remote: Total 22547 (delta 15781), reused 11594 (delta 7037)
Receiving objects: 100% (22547/22547), 17.78 MiB | 1.44 MiB/s, done.
Resolving deltas: 100% (15781/15781), done.
Checking connectivity... done.
Submodule 'freebsd-org' (https://github.com/freebsd/freebsd.git) registered for path 'freebsd-org'
Submodule 'rtems_waf' (git://git.rtems.org/chrisj/rtems_waf.git) registered for path 'rtems_waf'
Cloning into 'rtems_waf'...
remote: Counting objects: 83, done.
remote: Compressing objects: 100% (82/82), done.
remote: Total 83 (delta 51), reused 0 (delta 0)
Receiving objects: 100% (83/83), 19.95 KiB | 0 bytes/s, done.
Resolving deltas: 100% (51/51), done.
Checking connectivity... done.
Submodule path 'rtems_waf': checked out 'd793097d2032ca0ab2d5cf93fa84730865db6c03'
error: waf not found in the path