Open source software is software whose source code is published and made available to the public, enabling anyone to copy, modify and redistribute the source code without paying royalties or fees. Open source code evolves through community cooperation. These communities are composed of individual ...

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Is it safe to upgrade all outdated port when upgrading from Snow Leopard to Lion?

My Mac running Snow Leopard has several MacPorts based open source software packages installed. Upon the upgrade to Lion, all my ports are listed as outdated. It's safe to upgrade them en masse?