libpng.so.3 => not found

[unHandyAndy]

Ubuntu 9.10, 64 bit quad core.

Not sure what the problem is here.

$ ./algodoo
There are missing dependencies.
Please make sure that all the required libraries are installed.
Missing:
libpng.so.3 => not found


But I do have that lib entry.

$ ls -l /usr/lib/libpng*
-rw-r--r-- 1 root root 244588 2009-06-04 14:35 /usr/lib/libpng12.a
lrwxrwxrwx 1 root root 18 2009-11-13 19:46 /usr/lib/libpng12.so -> libpng12.so.0.37.0
lrwxrwxrwx 1 root root 18 2009-11-02 10:35 /usr/lib/libpng12.so.0 -> libpng12.so.0.37.0
-rw-r--r-- 1 root root 158640 2009-06-04 14:35 /usr/lib/libpng12.so.0.37.0
lrwxrwxrwx 1 root root 10 2009-11-13 19:46 /usr/lib/libpng.a -> libpng12.a
lrwxrwxrwx 1 root root 11 2009-11-13 19:46 /usr/lib/libpng.so -> libpng12.so
lrwxrwxrwx 1 root root 13 2009-11-25 02:14 /usr/lib/libpng.so.3 -> libpng12.so.0

Could the problem be that libpng.so.3 is a link?

[link0007]

Do you have the 64bit library for that? And do you have 64-bit algodoo?

[unHandyAndy]

Yes, it was the lib32 v. lib64 thing that got me. It's working now.