MPICH make error "unknown size for unsigned int."

If you are trying to install MPICH libraries, you may encounter the following error

make[4]: Entering directory `/home/vsingh/public/LIBRARIES/mpich-3.0.4/src/pm/hydra/tools/topo/hwloc/hwloc/src'
make[5]: Entering directory `/home/vsingh/public/LIBRARIES/mpich-3.0.4/src/pm/hydra/tools/topo/hwloc/hwloc/src'
CC topology.lo
CC traversal.lo
In file included from traversal.c:12:0:
/home/vsingh/public/LIBRARIES/mpich-3.0.4/src/pm/hydra/tools/topo/hwloc/hwloc/include/private/misc.h:41:2: error: #error "unknown size for unsigned int."
#error "unknown size for unsigned int."
^
make[5]: *** [traversal.lo] Error 1
make[5]: Leaving directory `/home/vsingh/public/LIBRARIES/mpich-3.0.4/src/pm/hydra/tools/topo/hwloc/hwloc/src'
make[4]: *** [all-recursive] Error 1
make[4]: Leaving directory `/home/vsingh/public/LIBRARIES/mpich-3.0.4/src/pm/hydra/tools/topo/hwloc/hwloc/src'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/home/vsingh/public/LIBRARIES/mpich-3.0.4/src/pm/hydra/tools/topo/hwloc/hwloc'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/vsingh/public/LIBRARIES/mpich-3.0.4/src/pm/hydra'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/vsingh/public/LIBRARIES/mpich-3.0.4'
make: *** [all] Error 2

Solution:

1. Edit the config.h file available at the following location
vi src/pm/hydra/tools/topo/hwloc/hwloc/include/private/autogen/config.h

2. Modify #define HWLOC_SIZEOF_UNSIGNED_INT 0 to #define HWLOC_SIZEOF_UNSIGNED_INT 4

3. Save the file and make clean

Hope this solves the problem.

GFS update : Change required to run WRF

GFS Analysis and Forecast System has been upgraded wef 1200 UTC, January 14, 2015. Your WRF forecast is likely to fail if you have not yet updated your scripts. Please do the following changes in order for the run to be successful.

Update your Vtable after downloading from this command/link
wget http://www2.mmm.ucar.edu/wrf/src/Vtable.GFS_new

GFS file naming conventions have also been changed, you need to download either of the file instead of gfs.t00z.pgrb2f00

You can download any of the file.
gfs.t00z.pgrb2.0p25.f000 : 0.25 degree
gfs.t00z.pgrb2.0p50.f000 : 0.50 degree
gfs.t00z.pgrb2.1p00.f000 : 1.00 degree
gfs.t00z.pgrb2.2p20.f000 : 2.50 degree

Please note that all gridded pressure GRIB files (*pgrb*) will be up to 20 minutes late. Therefore you will have to adjust your crontab to download the files.

Ungrib and metgrid may be successful but failing to change Vtable may stop real or wrf run or you may have NUM_METGRID_SOIL_LEVELS = 0 error.

Please leave your comments if you have any query