Deleted zstd and broke my system

[vasettoo]

Hi, everyone! As the topics says, I'm in trouble with my gentoo... I inadvertently unmerged app-arch/zstd from my system and now can't even boot into it. I have tried the steps from 'Fix my Gentoo' wiki to buld binpkg and install it into the broken system but portage gives me error that can't find C compiler and thеrefore cannot create executables. Is it possile to fix it or should I reinstall from scratch?
Best regards.

[NeddySeagoon]

vasettoo,

Its always possible to fix your Gentoo.
Depending on what you have done, fixing it may take longer than reinstalling but fixing it will teach you things about Gentoo that you will learn no other way.

We need to discover what broke. It sounds like more that just zstd as that should not stop booting.

There are two tests. Can you boot some live media, mount everything, then get into the chroot?
That will confirm that a few basics work.

When in the chroot, what does

[Ionen]

That sounds odd, it should've preserved libzstd.so.* and not be *that* broken (just no zstd executable), or did you lose that as well?

If so, getting libzstd.so.* back in /usr/lib64 is all you need for things linked against it (like gcc with USE=zstd) to work again.

The binpkg can be manually unpacked over as well (they're just tar archives), albeit it's better to just emerge zstd if restoring the library is enough to make things work again given unpacking doesn't record files and run pkg_* phases (still mostly goes back to normal after re-emerging over after though).

...albeit I'm not quite sure where the compiler comes in if we're talking about a binpkg, doesn't sound like you were emerging the binpkg. If making a binpkg be sure not to use the default zstd compression for it too

Edit: albeit hard to say what's going on really, may be good to check the config.log for the real error, can you compile anything at all? e.g.

[vasettoo]