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Is there a way to make yaourt does not reinstall when the package (from AUR) already installed

 $ yaourt -Q jruby
 local/jruby 1.7.3-1

but somehow

 $ yaourt --needed --noconfirm -S jruby

keep redownload (even if it has been downloaded before) and reinstall jruby

share|improve this question
You shouldn't, as PKGBUILD can be out dated at anytime. – warl0ck Mar 21 '13 at 3:55
but it doesn't even updating, the installed version is exactly the same as to be downloaded one – Kokizzu Mar 21 '13 at 4:21
If pkgver+pkgrel+pkgname are unchanged, it's useless to reinstall – Gilles Quenot Mar 21 '13 at 16:26
yes i know, and i do not want to reinstall, i just want it to install when not installed and reinstall when it's already installed but has an update, but yaourt keep reinstalling when the package is from AUR even when there is no new update – Kokizzu Mar 21 '13 at 21:02

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