docs are generated on all build machines

[Mathieu Malaterre <mathieu.malaterre@gmail.com>]

Dear all,

  I am looking at a bug reported for one of my package:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=619654

  It says that I am building the doc package on all buildd machine,
while I should not. I do not understand how i can achieve a portable
solution. How do i detect that I am on a buildd machine and I should
not rebuild the doc package ?

Thanks !
-- 
Mathieu