'openssl/arm_arch.h' file not found when integrating Firebase with Swift-Package-Manager

Using Swift-Package-Manager, Swift5.3.2, iOS14.4.1, XCode12.4,

I am trying to integrate Firebase into my iOS App.

I use the Swift Package Manager for Firebase (Beta) as described here.

After successfully integrating most packages from the Firebase selection choice (since I need most of them), I get the following error in Xcode:

'openssl/arm_arch.h' file not found

It seems to happen in the File crypto.c of the BoringSSL dependency added by the Firebase dependency. (see screenshot)

I know the problem has be described before (such as here, here, here and here). However, most of the people use Cocoapods. But in my case, I use the Swift Package Manager. So I open up this question again:

What do I need to do when Xcode said 'openssl/arm_arch.h' file not found ?

Yes, as is referenced in the comments, 7.9.0 was initially a bad release for the Firebase Swift Package Manager distribution. It was fixed and the 7.9.0 repo tag updated but Xcode/SPM caching prevented the new tag from being honored for people rerunning, so we made an equivalent 7.9.1 release to definitively fix the issue.

Full details at https://github.com/firebase/firebase-ios-sdk/issues/7777