How to guess what libraries uses a program

rluna@machine:~$ ldd myprogram
        libstdc++-libc6.2-2.so.3 => /usr/lib/libstdc++-libc6.2-2.so.3 (0x40018000)
        libm.so.6 => /lib/libm.so.6 (0x40061000)
        libc.so.6 => /lib/libc.so.6 (0x40083000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)