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I was wondering if there are any tools to present the compile time options/ flags of a package in Gentoo when emerging. I am referring to something like this

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Really ? Setting USE flags for different package is standard configuration of portage, did you read about its manual ? By placing some files in /etc/portage/XX.d/ (can't remember the name now), you overwide /etc/make.conf – warl0ck Aug 15 '12 at 10:19

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Take a look at app-portage/ufed.

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Thanks. Can ufed be used per package to set the USE flags? – are Aug 14 '12 at 9:51
Sorry, ufed is used to edit the system wide flags :/ – ensonic Aug 14 '12 at 10:05
:-( That's sad. It would be cool in my mind to have such a tool. – are Aug 14 '12 at 11:01
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Use emerge -av ... and it will display you a list of packages to be merged, including the USE flags.

To set the USE flags for a package either use /etc/portage/package.use or a tool like flaggie that does the job for you.

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emerge gentoolkit

Then equery u CATEGORY/PKG will give you the USE flags for CATEGORY/PKG, and if you then run the command euse -E FLAG or euse -D FLAG you can enable or disable FLAG globally. As mentinoed in another comment flaggie can adjust /etc/portage/package.use, but you shouldn't need to touch that often; you would want to avoid adding something a hundred times that could just be set globally.

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