[nasser]

Thanks, knc1!
While I was trying out, you already posted an example!

My output:

$ readelf -s libgnutls-deb0.so.28|grep GLIBC_2.1
    51: 00000000     0 FUNC    GLOBAL DEFAULT  UND clock_gettime@GLIBC_2.17 (13)
    91: 00000000     0 FUNC    GLOBAL DEFAULT  UND __fdelt_chk@GLIBC_2.15 (14)
$ readelf -s libstdc++.so.6|grep GLIBC_2.1
    16: 00000000     0 FUNC    GLOBAL DEFAULT  UND clock_gettime@GLIBC_2.17 (38)
    70: 00000000     0 FUNC    GLOBAL DEFAULT  UND __cxa_thread_atexit_impl@GLIBC_2.18 (40)
$ readelf -s libp11-kit.so.0|grep GLIBC_2.1
    71: 00000000     0 FUNC    GLOBAL DEFAULT  UND getauxval@GLIBC_2.16 (6)
$ objdump -T libgnutls-deb0.so.28|grep GLIBC_2.1
00000000      DF *UND*	00000000  GLIBC_2.17  clock_gettime
00000000      DF *UND*	00000000  GLIBC_2.15  __fdelt_chk
$ objdump -T libstdc++.so.6|grep GLIBC_2.1
00000000      DF *UND*	00000000  GLIBC_2.17  clock_gettime
00000000      DF *UND*	00000000  GLIBC_2.18  __cxa_thread_atexit_impl
$ objdump -T libp11-kit.so.0|grep GLIBC_2.1
00000000      DF *UND*	00000000  GLIBC_2.16  getauxval

So, the functions being requested are:

GLIBC_2.15: __fdelt_chk
GLIBC_2.16: getauxval
GLIBC_2.17: clock_gettime
GLIBC_2.18: __cxa_thread_atexit_impl

Actually, libp11-kit.so.0 should also be needing GLIBC_2.15, as per the runtime error messages, but in the above, it shows that only GLIBC_2.16 is being requested. Don't know why this difference.

Now, I'll try to check further as indicated by you...