After the WRF model is built, the next step is building the WPS program (if you plan to run real cases, as opposed to idealized cases). The WRF model MUST be properly built prior to trying to build the WPS programs. You can obtain the WPS code by following the same directions for obtaining WRF.
Go into the WPS directory:
cd WPS
Similar to the WRF model, make sure the WPS directory is clean, by issuing:
./clean
The next step is to configure WPS, however, you first need to set some paths for the ungrib libraries:
setenv JASPERLIB $DIR/grib2/lib
setenv JASPERINC $DIR/grib2/include
and then you can configure:
./configure
You should be given a list of various options for compiler types, whether to compile in serial or parallel, and whether to compile ungrib with GRIB2 capability. Unless you plan to create extremely large domains, it is recommended to compile WPS in serial mode, regardless of whether you compiled WRF in parallel. It is also recommended that you choose a GRIB2 option (make sure you do not choose one that states "NO_GRIB2"). You may choose a non-grib2 option, but most data is now in grib2 format, so it is best to choose this option. You can still run grib1 data when you have built with grib2.
Choose the option that lists a compiler to match what you used to compile WRF, serial, and grib2. **Note: The option number will likely be different than the number you chose to compile WRF
the metgrid.exe and geogrid.exe programs rely on the WRF model's I/O libraries. There is a line in the configure.wps file that directs the WPS build system to the location of the I/O libraries from the WRF model:
WRF_DIR = ../WRF
Above is the default setting. As long as the name of the WRF model's top-level directory is "WRF" and the WPS and WRF directories are at the same level (which they should be if you have followed exactly as instructed on this page so far), then the existing default setting is correct and there is no need to change it. If it is not correct, you must modify the configure file and then save the changes before compiling.
You can now compile WPS:
./compile >& log.compile
Compilation should only take a few minutes.
If the compilation is successful, there should be 3 executables in the WPS top-level directory, that are linked to their corresponding src/ directories:
geogrid.exe -> geogrid/src/geogrid.exe
ungrib.exe -> ungrib/src/ungrib.exe
metgrid.exe -> metgrid/src/metgrid.exe
Verify that they are not zero-sized (inside the */src/ directory). To see file size, you can type (for e.g.,):
ls -ls geogrid/src/geogrid.exe
.text+0x23d3): undefined reference to `nf_close_'
