[plt-scheme] unclear configure options

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Hello list,

I was looking at the options to configure and I foud a few for which I thought
the explanation wasn't very clear.

  --enable-libpng         use libpng instead of building (enabled by default)
  --enable-libjpeg        use libjpeg instead of building (enabled by default)

instead of building what? a bundled version? I looked briefly and I didn't see
any bundled version. It doesn't seem to be "use *** when available (enabled by
default)" either, cause then it would have said so. So if not these then what
does this mean?

  --enable-perl           use perl to regenerate certain sources

that sounds like it doesn't effect the output, but only the build process
itself, speeding it up most like. But if that is true, why would it be a
configure option at all? There is little point in not using perl to speed up
the build if it is available. So again, if not this then what does this mean?

Marijn
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