prelink ok?

[tong changda]

Hello everybody
sorry if not proper to ask here

I use prelink on arm dynamic library and execute file. prelink -av finished 
without warning, but readelf shows some unexpects:

/lib/libavformat.so.1               420b8000-420fb8b8
0x00000001 (NEEDED)                 Shared library: [libc.so.6]
.....
57: 420faacc    32 OBJECT  GLOBAL DEFAULT   13 pam_image_format
58: 00000000   252 FUNC    GLOBAL DEFAULT  UND strchr@GLIBC_2.0 (2)

our symbol external is left unsolved, but local symbol are solved the 
address normally,
I think after prelink there should be no UND symbol,Did I compile the 
library the wrong way?
thanks

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