# Problem with new Package Manager System Library Targets **URL:** \ **Category:** Using Swift\ **Tags:** spm\ **Created:** [September 21, 2018, 7:43pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358 "2018-09-21T19:43:06Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![freda](https://avatars.discourse-cdn.com/v4/letter/f/47e85d/32.png) [@freda](https://forums.swift.org/u/freda)\ **Post date:** [September 21, 2018, 7:43pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358/1 "2018-09-21T19:43:06Z")
With the introduction of Swift 4.2 I got a deprecation warning stating that I have to use a system library: ```swift warning: system packages are deprecated; use system library targets instead ``` The library that was being linked was a library that did not really link a library, it just loaded a header file which I needed to do some low level network requests. So the `module.modulemap` used to contain: ```nohighlight module Network [system] { header export * } ``` The `Package.swift` file contained: ```swift // swift-tools-version:3.1 import PackageDescription let package = Package(name: "Network") ``` It seems, if I read the [SPM System Library Target](https://github.com/apple/swift-evolution/blob/master/proposals/0208-package-manager-system-library-targets.md) correctly there is no longer an option to specify the header. Am I missing something or is this still possible in 4.2? Or have we removed this possibility with this release? Any advise would be appreciated. ---
**Author:** ![Aciid](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/aciid/32/429_2.png) [@Aciid](https://forums.swift.org/u/Aciid)\ **Post date:** [September 21, 2018, 8:42pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358/2 "2018-09-21T20:42:32Z")
You need to update the manifest file and declare a system library target. The new manifest will probably look something like: ```swift // swift-tools-version:4.2 import PackageDescription let package = Package( name: "Network", products: [ .library(name: "Network", targets: ["Network"]), ], targets: [ .systemLibrary(name: "Network", path: "."), ] ) ``` ---
**Author:** ![freda](https://avatars.discourse-cdn.com/v4/letter/f/47e85d/32.png) [@freda](https://forums.swift.org/u/freda)\ **Post date:** [September 21, 2018, 8:44pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358/3 "2018-09-21T20:44:15Z")
Thanks for your response. But where would I specify `/usr/include/ifaddrs.h`? ---
**Author:** ![Aciid](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/aciid/32/429_2.png) [@Aciid](https://forums.swift.org/u/Aciid)\ **Post date:** [September 21, 2018, 8:45pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358/4 "2018-09-21T20:45:10Z")
In the same module.modulemap file, that part hasn't changed. ---
**Author:** ![freda](https://avatars.discourse-cdn.com/v4/letter/f/47e85d/32.png) [@freda](https://forums.swift.org/u/freda)\ **Post date:** [September 21, 2018, 9:02pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358/5 "2018-09-21T21:02:52Z")
So I have made the changes as you suggested and get the following errors when I use the library: ```nohighlight warning: Ignoring declared target(s) 'Network' in the system package warning: system packages are deprecated; use system library targets instead ``` So it doesn't recognize that this is a system library. I tried removing the product section, given that I don't really build a library. It is all about the header nothing else. No luck. The message is identical. ---
**Author:** ![Aciid](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/aciid/32/429_2.png) [@Aciid](https://forums.swift.org/u/Aciid)\ **Post date:** [September 21, 2018, 9:05pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358/6 "2018-09-21T21:05:52Z")
Oh I think you also need to move the modulemap to a directory under Sources. So the modulemap file should be at: ```swift /Sources/Network/module.modulemap ``` ---
**Author:** ![freda](https://avatars.discourse-cdn.com/v4/letter/f/47e85d/32.png) [@freda](https://forums.swift.org/u/freda)\ **Post date:** [September 21, 2018, 9:25pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358/7 "2018-09-21T21:25:57Z")
Thanks. I got it working. I had to remove the path in `systemLibrary` definition. ---
**Author:** ![Aciid](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/aciid/32/429_2.png) [@Aciid](https://forums.swift.org/u/Aciid)\ **Post date:** [September 21, 2018, 9:27pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358/8 "2018-09-21T21:27:16Z")
Great! ---
**Author:** ![joesus](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/joesus/32/24541_2.png) [@joesus](https://forums.swift.org/u/joesus)\ **Post date:** [August 12, 2019, 3:40pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358/9 "2019-08-12T15:40:22Z")
Side note. I ran into this error while trying to code along with the examples at: > Specifically the line `swift package init --type system-module` Is it possible to update these docs? I would update them myself and open a PR but as somebody just at the tutorials phase of this I'm not sure I'm qualified to write the tutorial yet. 😛 ---
**Author:** ![vine](https://avatars.discourse-cdn.com/v4/letter/v/6bbea6/32.png) [@vine](https://forums.swift.org/u/vine)\ **Post date:** [March 21, 2022, 3:45pm UTC](https://forums.swift.org/t/problem-with-new-package-manager-system-library-targets/16358/10 "2022-03-21T15:45:11Z")
Is there an update now?