def libc_ver():<EOL>
glibc_version = glibc_version_string()<EOL>if glibc_version is None:<EOL><INDENT>return ("<STR_LIT>", "<STR_LIT>")<EOL><DEDENT>else:<EOL><INDENT>return ("<STR_LIT>", glibc_version)<EOL><DEDENT>
Try to determine the glibc version

    Returns a tuple of strings (lib, version) which default to empty strings
    in case the lookup fails.