Bug#666066: mpich2: on testing, mpich2 needs libhwloc.so.4 which is not available (libhwloc.so.5 is available)

[alliot]

Package: mpich2
Version: 1.4.1-1+b1
Severity: grave
Justification: renders package unusable

Dear Maintainer,

mpich2 on current debian testing release (wheezy) is properly installed, but
when running an mpi program with mpirun, there is a (fatal) error:

mpirun: error while loading shared libraries: libhwloc.so.4: cannot open 
shared object file: no such file or directory

libhwloc.so.4 is not available, the only available package is libhwloc.so.5

Tank you

-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages mpich2 depends on:
ii  hwloc-nox              1.4.1-1
ii  libc6                  2.13-27
ii  libcr0                 0.8.2-15
ii  libhwloc5 [libhwloc4]  1.4.1-1
ii  libmpich2-3            1.4.1-1+b1

Versions of packages mpich2 recommends:
ii  libmpich2-dev  1.4.1-1+b1

Versions of packages mpich2 suggests:
pn  blcr-util   0.8.2-15
pn  mpich2-doc  <none>

-- no debconf information