I have some (commercial, third-party) software that was previously executing correctly on SLES11 SP2, but now it exits with the following error:

code: relocation error: /lib64/libnsl.so.1: symbol strlen, version GLIBC_2.2.5 not defined in file libc.so.6 with link time reference

According to my administrator, nothing on the system has changed. I can't think of anything in my path/environment that would have changed. Has anyone seen this problem before? How do I resolve it?