---
name: "Config::Extensions"
section: "3perl"
platform: "linux"
package: "perl"
version: "5.44.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Config::Extensions/3perl"
---

# Config::Extensions(3perl)

hash lookup of which core extensions were built.

## NAME

Config::Extensions - hash lookup of which core extensions were built.

## SYNOPSIS

```
    use Config::Extensions '%Extensions';
    if ($Extensions{PerlIO::via}) {
        # This perl has PerlIO::via built
    }
```

## DESCRIPTION

The Config::Extensions module provides a hash `%Extensions` containing all the core extensions that were enabled for this perl. The hash is keyed by extension name, with each entry having one of 3 possible values:

- dynamic

  The extension is dynamically linked

- nonxs

  The extension is pure perl, so doesn't need linking to the perl executable

- static

  The extension is statically linked to the perl binary

As all values evaluate to true, a simple `"if"` test is good enough to determine whether an extension is present.

All the data uses to generate the `%Extensions` hash is already present in the `"Config"` module, but not in such a convenient format to quickly reference.

## AUTHOR

Nicholas Clark \<nick@ccl4.org\>