The problem is probably not so much with the OS as it is the several software packages involved. First, there is the WRF numerical weather model, then there is the MPICH implementation, then there is the netcdf libraries, and lastly, the portland group fortran compiler. From what I've been able to glean from archived messages, support links, and support staff as well, this whole mess is probably not even close to working under the conditions of the compile, however it will compile and run under the single threaded model, with no nesting. The output of the attempted execution is: ./real.exe: /usr/pgi/linux86-64/6.0/lib/libpthread.so.0: version `GLIBC_2.3.3' not found (required by /lib64/tls/librt.so.1) The three executables, real.exe, wrf.exe, and ndown.exe all compile with no errors. The environment it *should* be running under of course would be either open mp, or mpich if there were a cluster, however in this situation, there is but the single machine, a dual Xeon system with the 4.1 release of CentOS. Attempting to execute under OMP or mpich both gives the same error message as above, so there is definately a runtime problem. I am not positive if it is coming from the portland group compiler output, the mpi compiler, or what, but from the message, it leads me to believe it could in fact be a portland group compile problem. Others have built the software and have it run under earlier versions of RH, FC, etc., but I've not seen or read anyone using any of the 4.x branches of any of the OS'. I am not a programmer in any sense of the word. So, that's pretty much the extent of the situation. I do know there is a problem with the intel fortran compiler 9.0.21, and the software will NOT build or run under that situation. Intel is supposedly working on a fix, but it takes about 90+ minutes to compile the code, and from what I've seen, 1.3gb of memory at most during the compile process. Maciej Żenczykowski wrote: > If this is software you are attempting to compile, then maybe it would > be best to fix it... post the compilation/linker error... > > Cheers, > > MaZe. > > On Sat, 1 Oct 2005, Sam Drinkard wrote: > >> Unfortunately, No. The current version of the x86-64 does not have, >> and I can't install the glibc-2.3.3 libs to run the software, and I'm >> pretty sure the i386 version would be the same, however I was hoping >> someone could tell me. There should be some backwards compatibility, >> but apparently there is a specific call in the 2.3.3 lib that is not >> available in the 2.3.4. >> >> William Warren wrote: >> >>> You can't drop back to the 32-bit version of CenttOS 4? >>> > -- Snowman