# Package dependency problem **URL:** \ **Category:** Questions & Answers\ **Tags:** package, dependency\ **Created:** [November 10, 2023, 2:16pm UTC](https://racket.discourse.group/t/package-dependency-problem/2490 "2023-11-10T14:16:45Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![matteo-daddio](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/matteo-daddio/32/1245_2.png) [@matteo-daddio](https://racket.discourse.group/u/matteo-daddio)\ **Post date:** [November 10, 2023, 2:16pm UTC](https://racket.discourse.group/t/package-dependency-problem/2490/1 "2023-11-10T14:16:45Z")
Hi, as an exercise I developed a data structure, a double linked ring. I create a github repository and I put it in the Racket catalog. I took _Ring Buffer_ and _Priority Queues_ as examples. Everything is fine except the package dependencies. I installed the package through `raco pkg install double-linked-ring` and it installed the `data/double-linked-ring` collection. Then I tryed `raco setup --check-pkg-deps double-linked-ring` and `raco setup --check-pkg-deps data/double-linked-ring` but they didn't work. The error message was `collection-path: collection not found`. Then tried `raco setup --check-pkg-deps data` and it worked, but I can't understand the dependency messages: ```scheme raco setup: --- checking package dependencies --- raco setup: found undeclared dependency: raco setup: mode: run raco setup: for package: "double-linked-ring" raco setup: on package: "rackunit-lib" raco setup: dependent source: C:\Users\scacco matto\AppData\Roaming\Racket\8.10\pkgs\double-linked-ring\data\compiled\test_rkt.zo raco setup: used module: (lib "rackunit/main.rkt") raco setup: found undeclared dependency: raco setup: mode: run raco setup: for package: "double-linked-ring" raco setup: on package: "rackunit-lib" raco setup: dependent source: C:\Users\scacco matto\AppData\Roaming\Racket\8.10\pkgs\double-linked-ring\data\compiled\test_rkt.zo raco setup: used module: (lib "rackunit/text-ui.rkt") raco setup: --- summary of package problems --- raco setup: undeclared dependency detected raco setup: for package: "double-linked-ring" raco setup: on package: raco setup: "rackunit-lib" ``` Can you help me? ---
**Author:** ![samth](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/samth/32/3_2.png) [@samth](https://racket.discourse.group/u/samth)\ **Post date:** [November 10, 2023, 3:13pm UTC](https://racket.discourse.group/t/package-dependency-problem/2490/2 "2023-11-10T15:13:56Z")
1. Your package depends on `rackunit-lib` at runtime, not just at build time. 2. `raco setup` in the default mode takes a _collection_ as an argument. `data` is a collection, but `data/double-linked-ring` is not (it's a module path for a specific module) and `double-linked-ring` is also not (it's a package name). Probably you want `raco setup --pkgs double-linked-ring` or maybe `raco setup data`. 3. You can use `raco setup --fix-pkg-deps --pkgs double-linked-ring` to fix the problem automatically. ---
**Author:** ![benknoble](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/benknoble/32/16_2.png) [@benknoble](https://racket.discourse.group/u/benknoble)\ **Post date:** [November 10, 2023, 3:21pm UTC](https://racket.discourse.group/t/package-dependency-problem/2490/3 "2023-11-10T15:21:50Z")
It appears you have a test file that depends on rackunit, so you need to add `rackunit-lib` to your info.rkt. N.B. `raco setup` typically accepts a collection name (such as `data`); if you want to use a package name, you use `--pkgs`. ---
**Author:** ![matteo-daddio](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/matteo-daddio/32/1245_2.png) [@matteo-daddio](https://racket.discourse.group/u/matteo-daddio)\ **Post date:** [November 10, 2023, 3:34pm UTC](https://racket.discourse.group/t/package-dependency-problem/2490/4 "2023-11-10T15:34:29Z")
Thank you, where can I find it in the documentation? Matteo ---
**Author:** ![samth](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/samth/32/3_2.png) [@samth](https://racket.discourse.group/u/samth)\ **Post date:** [November 10, 2023, 4:08pm UTC](https://racket.discourse.group/t/package-dependency-problem/2490/5 "2023-11-10T16:08:57Z")
1. Documentation about dependencies is here: [4 Package Metadata](https://docs.racket-lang.org/pkg/metadata.html#%28idx._%28gentag._3._%28lib._pkg%2Fscribblings%2Fpkg..scrbl%29%29%29) 2. Documentation about `raco setup` command line use is here: [6.1 Running raco setup](https://docs.racket-lang.org/raco/running.html) 3. Documentation about dependency checking is here: [6.5 Package Dependency Checking](https://docs.racket-lang.org/raco/setup-check-deps.html) ---
**Author:** ![matteo-daddio](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/matteo-daddio/32/1245_2.png) [@matteo-daddio](https://racket.discourse.group/u/matteo-daddio)\ **Post date:** [November 13, 2023, 6:32pm UTC](https://racket.discourse.group/t/package-dependency-problem/2490/6 "2023-11-13T18:32:22Z")
Thanks for your help. I’m starting to understand the package system, especially the relationship between packages and collections. It’s very sofisticated and very interesting. The easiest solution I found is to move the test.rkt module outside the data collection directory. This was the problem. Now the package works correctly. I put the test module in the data directory on purpose, I wanted to see what would happen. If you need a double linked ring you can use my package. The documentation is under the _Data Structure_ section. If you have suggestions on how to improve it you are welcome. Matteo