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trying to add a specific jar to a version catalog that is currently resolved using this notation:

```implementation "com.my-company:my-project:my-version:spec"```
I haven't been able to find a way to declare the ':spec' specific jar within the confines of the version catalog -- any ideas?

Yes, don't :-)
The version catalog is about coordinates and versions.
Classifier (the "spec"), or artifact extension (the thing after @ in string notation) you specify when using the version catalog entry.

That totally makes sense - the version catalog is just the main descriptor...

In the version catalog notation, then, when I have

implementation(libs.<myLibraryReference>)

where do I put ':spec' ?

Oh, I found it....

// build.gradle.kts
    dependencies {
        // Using the variantOf helper for more structured declaration
        implementation(variantOf(libs.netty.epoll) {
            classifier("linux-x86_64")
        })

        // Alternatively, using the artifact block
        implementation(libs.netty.epoll) {
            artifact {
                classifier = "linux-x86_64"
            }
        }
    }