Here is symbol dumps of both plugin and libmemcached.so
sectoid@dagon:~$ ldd /usr/lib/php5/20100525+lfs/memcached.so
linux-gate.so.1 => (0xb7775000)
libmemcached.so.10 => /usr/lib/i386-linux-gnu/libmemcached.so.10
(0xb76ff000)
libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0xb76e6000)
libc.so.6 => /lib/i386-linux-gnu/i686/cmov/libc.so.6 (0xb7588000)
librt.so.1 => /lib/i386-linux-gnu/i686/cmov/librt.so.1 (0xb757f000)
libstdc++.so.6 => /usr/lib/i386-linux-gnu/libstdc++.so.6 (0xb7493000)
libm.so.6 => /lib/i386-linux-gnu/i686/cmov/libm.so.6 (0xb746d000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xb7450000)
/lib/ld-linux.so.2 (0xb7776000)
libpthread.so.0 => /lib/i386-linux-gnu/i686/cmov/libpthread.so.0
(0xb7436000)
sectoid@dagon:~$ ldd /usr/lib/i386-linux-gnu/libmemcached.so.10
linux-gate.so.1 => (0xb7752000)
librt.so.1 => /lib/i386-linux-gnu/i686/cmov/librt.so.1 (0xb76e8000)
libstdc++.so.6 => /usr/lib/i386-linux-gnu/libstdc++.so.6 (0xb75fc000)
libm.so.6 => /lib/i386-linux-gnu/i686/cmov/libm.so.6 (0xb75d5000)
libc.so.6 => /lib/i386-linux-gnu/i686/cmov/libc.so.6 (0xb7478000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xb745b000)
libpthread.so.0 => /lib/i386-linux-gnu/i686/cmov/libpthread.so.0
(0xb7442000)
/lib/ld-linux.so.2 (0xb7753000)
sectoid@dagon:~$ readelf -W -s --dyn-syms
/usr/lib/php5/20100525+lfs/memcached.so | grep version
41: 00000000 0 FUNC GLOBAL DEFAULT UND memcached_version
71: 00000000 0 FUNC GLOBAL DEFAULT UND memcached_lib_version
96: 00000000 0 NOTYPE GLOBAL DEFAULT UND
memcached_server_micro_version
138: 00000000 0 NOTYPE GLOBAL DEFAULT UND
memcached_server_major_version
139: 00000000 0 NOTYPE GLOBAL DEFAULT UND
memcached_server_minor_version
sectoid@dagon:~$ readelf -W -s --dyn-syms /usr/lib/i386-linux-
gnu/libmemcached.so.10 | grep version
216: 00023ad0 861 FUNC GLOBAL DEFAULT 12 memcached_version
361: 00023ab0 18 FUNC GLOBAL DEFAULT 12 memcached_lib_version-- WBR, Gleb Golubitsky Gnolltech
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