[Gretl-devel] Contribute to Gretl code (FIX for gnuplot 4.2).

[Hélio Guilherme]

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Hi Allin, Jack and developers,

I upgraded my gnuplot to it's latest version, 4.2, and then gretl's
graphics got broken, like saving to a PNG. So here is a fix for it.

New gnuplot 4.2 syntax made a change from "set term" to "set terminal".
The fix modifies files in gui2 and also the configure script, to provide
gnuplot version detection, and PNG support (it advises users to install
PNG support in gnuplot).

I decided to send the complete files and not patches because I am too
lazy ;).

Have fun,

Hélio Guilherme

(only tested in OpenSuse 10.2 i586 32bit)
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