I just ran rebuild ci_hsc and then perhaps 15 minutes later rebuild validation_data_hsc.
Why did the second invocation trigger a rebuild of afw (2.2016.10-8-g2cef314+2), whose last commit to master was March 31?
The rebuild ci_hsc did not trigger a rebuild of afw.
[serenity ~] rebuild validation_data_hsc
validation_data_hsc: ok (2470.3 sec).
obs_subaru: ok (0.3 sec).
daf_persistence: ok (0.3 sec).
mariadbclient: ok (0.2 sec).
pex_logging: ok (0.3 sec).
pex_exceptions: ok (0.3 sec).
base: ok (0.3 sec).
boost: ok (0.2 sec).
python: ok (0.2 sec).
sconsUtils: ok (0.3 sec).
scons: ok (0.2 sec).
doxygen: ok (0.2 sec).
swig: ok (0.2 sec).
daf_base: ok (0.3 sec).
utils: ok (0.3 sec).
numpy: ok (0.2 sec).
pex_policy: ok (0.3 sec).
pyfits: ok (0.2 sec).
python_d2to1: ok (0.2 sec).
stsci_distutils: ok (0.2 sec).
pyyaml: ok (0.3 sec).
daf_butlerUtils: ok (0.3 sec).
afw: ok (0.5 sec).
pex_config: ok (0.4 sec).
ndarray: ok (0.5 sec).
eigen: ok (0.5 sec).
fftw: ok (0.7 sec).
cfitsio: ok (0.7 sec).
wcslib: ok (0.7 sec).
minuit2: ok (0.6 sec).
gsl: ok (0.4 sec).
matplotlib: ok (0.4 sec).
afwdata: ok (0.3 sec).
skypix: ok (0.3 sec).
geom: ok (0.2 sec).
pipe_tasks: ok (0.3 sec).
pipe_base: ok (0.3 sec).
obs_test: ok (0.3 sec).
esutil: ok (0.2 sec).
meas_base: ok (0.4 sec).
coadd_utils: ok (0.3 sec).
meas_algorithms: ok (0.3 sec).
meas_astrom: ok (0.3 sec).
astrometry_net: ok (0.2 sec).
meas_deblender: ok (0.4 sec).
astrometry_net_data: ok (0.3 sec).
ip_isr: ok (0.4 sec).
ip_diffim: ok (0.3 sec).
coadd_chisquared: ok (0.3 sec).
skymap: ok (0.3 sec).
meas_modelfit: ok (0.3 sec).
shapelet: ok (0.3 sec).
meas_extensions_psfex: ok (0.3 sec).
psfex: ok (0.3 sec).
testdata_subaru: ok (0.2 sec).
# BUILD ID: b1973
cfitsio: 3360.lsst4 (already installed).
minuit2: 5.28.00.lsst2-1-gdae2fb7 (already installed).
eigen: 3.2.5-1-g70497dd (already installed).
python: 0.0.3 (already installed).
swig: 3.0.2.lsst1 (already installed).
mariadbclient: 10.1.11.lsst2 (already installed).
pyyaml: 3.11.lsst1 (already installed).
doxygen: 1.8.5.lsst1 (already installed).
wcslib: 5.13.lsst1 (already installed).
boost: 1.59.lsst5 (already installed).
fftw: 3.3.4.lsst2 (already installed).
scons: 2.3.5 (already installed).
testdata_subaru: master-gf9ba9abdbe (already installed).
python_d2to1: 0.2.12.lsst1 (already installed).
sconsUtils: 2016_01.0-4-g49bc714 (already installed).
numpy: 0.0.2 (already installed).
gsl: 1.16.lsst3 (already installed).
astrometry_net: 0.50.lsst2+6 (already installed).
matplotlib: 0.0.2 (already installed).
base: 2.2016.10+2 (already installed).
afwdata: 2.2016.10+2 (already installed).
pex_exceptions: 2016_01.0+6 (already installed).
ndarray: 2016_01.0-1-g4d828c7 ok (31.4 sec).
psfex: 2016_01.0+4 (already installed).
esutil: 0.5.3 (already installed).
stsci_distutils: 0.3.7-1-gb22a065+1 (already installed).
geom: 8.0.0.1+16 (already installed).
astrometry_net_data: 8.0.0.0+19 (already installed).
utils: 2016_01.0+7 (already installed).
pyfits: 3.4.0+2 (already installed).
daf_base: 2016_01.0+7 (already installed).
pex_policy: 2016_01.0+7 (already installed).
pex_logging: 2016_01.0-1-g90faa74+3 (already installed).
pex_config: 2016_01.0+7 (already installed).
daf_persistence: 2016_01.0-8-geb625e2 (already installed).
afw: 2.2016.10-8-g2cef314+2 ............................................................................................................