Which libc is that?
For Linux, it can be fun to figure out which libc version your apps are bound to. Â After a bit of digging, I found that you can actually run the libc.so as a \*binary\* - which outputs its own version info. This will work on all the linuxes, without resorting to asking a package management tool:
ldd /bin/sh |grep libc.so | awk '{print $3}' | sh