timestamps in binaries are considered bugs:

/usr/share/color/argyll/RefMediumGamut.gam differs (ASCII text)
[  540s] --- old//usr/share/color/argyll/RefMediumGamut.gam    2015-02-03
20:11:23.000000000 +0000
[  540s] +++ new//usr/share/color/argyll/RefMediumGamut.gam    2015-10-28
01:07:59.000000000 +0000
[  540s] @@ -2,7 +2,7 @@
[  540s]  
[  540s]  DESCRIPTOR "Argyll Gamut surface poligon data"
[  540s]  ORIGINATOR "Argyll CMS gamut library"
[  540s] -CREATED "Tue Feb  3 20:11:21 2015"
[  540s] +CREATED "Wed Oct 28 01:07:57 2015"
[  540s]  KEYWORD "COLOR_REP"
[  540s]  COLOR_REP "LAB"
[  540s]  KEYWORD "GAMUT_CENTER"

Please put a timestamp there that doesn't change at buildtime, but survives
rebuilds.