libdatetime-perl [hurd-i386]: Build-dep installed, but not used

[Ansgar Burchardt <ansgar@43-1.org>]

Hi,

the build for libdatetime-perl failed[1] because the version of
Module::Build included within perl was too old.  However,
libdatetime-perl has an explicit build-dep on libmodule-build-perl.
This dependency was installed, but apparently not used:

  Setting up libmodule-build-perl (0.360700-1) ...
  [...]
  Module::Build version 0.3601 required--this is only version 0.340201
  at Build.PL line 5.
  BEGIN failed--compilation aborted at Build.PL line 5.

As libmodule-build-perl is an architecture-independent package, the only
reason I can think of for this to happen is perl being configured to
prefer nodules provided by the core perl packages over those provided by
extra packages. What does "perl -V" say about the value of @INC?

Regards,
Ansgar

[1] <https://buildd.debian.org/fetch.cgi?pkg=libdatetime-perl&arch=hurd-i386&ver=2:0.5900-1&stamp=1278009648&file=log&as=raw>