How do I get depclean to leave packagages installed?

[audiodef]

I have premake-3.7 on my system and I need it to stay there. I've done emerge --oneshot =premake-3.7 but emerge --depclean still wants to remove it. How do I get depclean to leave this version alone?
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[John R. Graham]

[audiodef]

Aha!

Thanks!
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[John R. Graham]

You're welcome. To clarify what that does, --depclean only removes things that are not in your world set. premake-3.7 must've been a dependency at some point but must no longer be. Thus it's installed but not part of world. The emerge without the --oneshot or --update options forces it to be added to the world set; the --noreplace option keeps it from being unnecessarily rebuilt. A plain old

[audiodef]

I emerged it manually. The problem, as I see from your explanation, is that higher versions are called for as dependencies, forcing rebuilds. Thanks for filling me in.
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[Mike Hunt]

... it won't quite work using emerge --noreplace =<package>-<version>
That will add <category>/<package> to the world file.

Using emerge --noreplace =<category>/<package>-<version>
will add the specific version to the world file.

Of course when a package depends on a higher/lower version, then up/downgrading the dependency is required (assuming it actually exists in portage, premake does not), therefore masking the dependent package would be required.
Hopefully that would not break a greater dependency chain.

[audiodef]

I seem to be doing fine with John's suggestion, but thanks for the extra info. I'll keep it in mind if something looks funny later... like me, late at night.
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[Mike Hunt]

Indeed, John always gives the best answers.

Now what I posted used to work, it seems now that it makes no difference. No idea why.
But manually adding the =......../.......<-version> to the world file does work to restrict any up/downgrading and unwanted depcleaning.