Ocean Modeling Discussion

hello,
I am new in ROMS, just trying to compile for upwelling case. Compiling for ./OceanG is succsess but why when i run some error come, i.e:
-----
[endros@pop4 roms]$ ./oceanG < ROMS/External/ocean_upwelling.in
./oceanG: error while loading shared libraries: libhdf5_hl.so.6: cannot open shared ...

Hello experts,
I am a new user of ROMS model,I have access to download the model and also already have installed the SVN client software (Collabnet Subversion) on my linux machine (CentOS 5.3).But, I am unable to download after typing the following commands:
----
[endros@pop4 ~]$ svn checkout ...