As of Simile version 5.0, glibc version 2.4 is required to run the Linux Simile build available from simulistics.com. (If you have an earlier version we may be able to build Simile for you. Let us know the version of glibc you have and other details of your Linux distribution.)
To find the version of glibc on most systems, including Debian, call the library as a program:
(uiserver)::~ > /lib/libc.so.6
GNU C Library stable release version 2.3.6, by Roland McGrath et al.
On Debian-based systems:
Open up a command prompt and enter
$ sudo aptitude show libc6
NB the sudo assumes that you need root permissions to run the aptitude command and have the password.