Try Festival's fast little brother Flite . It only needs basic c libs

   ldd  /home/zentara/bin/flite

    linux-gate.so.1 =>  (0xffffe000)
    libm.so.6 => /lib/libm.so.6 (0xb7eb0000)
    libc.so.6 => /lib/libc.so.6 (0xb7d6e000)
    /lib/ld-linux.so.2 (0xb7ef7000)

 Use it like this:
   flite -t text   #says the word text, or you can give it a file to r
+ead
[download]

It's only drawback is there is no selection of voices, like Festival has. (Well you can use FestVox voices, but if you can't install Festival, I don't know how it would work out). You can hear how it sounds at the end of flash japh. There it is at it's 8kHz low quality, it sounds better on a local machine outputting directly to a sound card.