relocation error, PNG12 not defined

[Shish]

$ pngcrush in.png out.png
 ... standard copyright text ...
pngcrush: relocation error: pngcrush: symbol png_read_data, version PNG12_0 not defined in file libpng12.so.0 with li
nk time reference
$ ldd `which pngcrush`
        linux-gate.so.1 => (0xffffe000)
        libpng12.so.0 => /usr/lib/libpng12.so.0 (0xb7f1b000)
        libz.so.1 => /usr/lib/libz.so.1 (0xb7f07000)
        libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7dd8000)
        libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0xb7db6000)
        /lib/ld-linux.so.2 (0xb7f50000)

[Shish (shish)]

searched for all pngcrush bugs, found none, reported this, then saw the "Latest bugs in pngcrush in ubuntu:" sidebox, which *does* have things in... how odd :-/