Can't load plugin libmp3_decoder: file not found

first, I wanna say Hello everybody.
Unfortunately I have a proble with moc.

description as follows

I have installed(./configure make make install) ffmpeg-0.6.1 libid3tag-0.15.1b libid3tag-0.15.1b and librcc-0.2.9.
Then I install moc-2.4.4.
When I start moc, it said Can't load plugin libmp3_decoder: file not found
However I find libmp3_decoder.la, libmp3_decoder.so and libmp3_decoder.a

ldd /usr/local/lib/moc/decoder_plugins/libmp3_decoder.so
it said linux-gate.so.1 => (0x00a72000)
libmad.so.0 => not found
libid3tag.so.0 => not found
libz.so.1 => /lib/libz.so.1 (0x00ec7000)
librcc.so.0 => not found
libm.so.6 => /lib/libm.so.6 (0x0018b000)
libdl.so.2 => /lib/libdl.so.2 (0x00d6a000)
libpthread.so.0 => /lib/libpthread.so.0 (0x009ea000)
libc.so.6 => /lib/libc.so.6 (0x0024e000)
/lib/ld-linux.so.2 (0x00811000)

mocp -SDF
it said Loading plugins from /usr/local/lib/moc/decoder_plugins...
Loading plugin libmp3_decoder...
Can't load plugin libmp3_decoder: file not found

And I'm using a redhat.

this problem really MAKEs me MAD.
Do you have an idea to solve it?