This may be a tad O.T., but I have to ask somebody. In compiling WRF model, everything seems to build but at runtime, I get this error message: 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) There appears to be something missing from the library, but not being smart enough to know what each one provides, nor know how to look at it, I'd sure like some pointers if anyone cares to help. If you need more info, I'd be happy to go offnet with it. Sam -- Snowman