Based on my experience running feisty on a G3, some of you are having a
problem that has nothing to do with altivec - it's fsqrt (from
-mpowerpc-gpopt) that's causing SIGILL - see #104630. The problem is
many of these config scripts check to see what instructions to use based
on what host they are compiling on, which results in using fsqrt() if
you build on a G5. This is why recompiling with --disable-altivec works
- recompiling on a G3, regardless of options, results in a working
binary. Whomever compiles this stuff should be using -mcpu=740
-mtune=740 in CFLAGS (even if mplayer yells at you for using non-default
flags).

-- 
Altivec detection broken on G3 (multiple packages)
https://bugs.launchpad.net/bugs/74282
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Bugs, which is the bug contact for Ubuntu.

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