# CMake Error during PlusLib SuperBuild: "The source does not match..."

**URL:** https://discourse.slicer.org/t/cmake-error-during-pluslib-superbuild-the-source-does-not-match/43972
**Category:** Support
**Tags:** plus, linux
**Created:** [August 5, 2025, 3:40pm UTC](https://discourse.slicer.org/t/cmake-error-during-pluslib-superbuild-the-source-does-not-match/43972 "2025-08-05T15:40:36Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Jaeseong](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jaeseong/32/81450_2.png) [@Jaeseong](https://discourse.slicer.org/u/Jaeseong)
#### Post date: [August 5, 2025, 3:40pm UTC](https://discourse.slicer.org/t/cmake-error-during-pluslib-superbuild-the-source-does-not-match/43972/1 "2025-08-05T15:40:36Z")

</div>

Hi everyone,

I’m encountering an error during the building of **Pluslib** , which is a dependency for **Slicer** on **Ubuntu**. My goal is to acquire **ultrasound images** from a **Windows machine** using the **PLUS server**.

I followed the instructions in this link: [PlusBuild/Docs/BuildInstructionsLinux.md at master · PlusToolkit/PlusBuild · GitHub](https://github.com/PlusToolkit/PlusBuild/blob/master/Docs/BuildInstructionsLinux.md)

**Error Message:**

```auto
[73%] Performing configure step for 'PlusLib'
CMake Error: The source "/home/user/devel/PlusBuild/PlusBuild-bin/PlusLib/CMakeLists.txt" does not match the source "/home/user/Slicer-SuperBuild-Debug/RapidJSON/CMakeLists.txt" used to generate cache. Re-run cmake with a different source directory.
make[2]: *** [CMakeFiles/PlusLib.dir/build.make:100: PlusLib-prefix/src/PlusLib-stamp/PlusLib-configure] Error 1
make[1]: *** [CMakeFiles/Makefile2:983: CMakeFiles/PlusLib.dir/all] Error 2
make: *** [Makefile:101: all] Error 2

```

**What I’ve tried so far:**

1. I completely deleted the build directory (`PlusBuild-bin`) and started the build from scratch.

2. I manually removed `CMakeCache.txt` and the `CMakeFiles` directory and then re-ran CMake.

Neither of these steps resolved the issue.

**My environment:**

- Ubuntu 22.04 LTS

- Slicer 5.6.2 (To use SlicerRos2)

Any insights into why this error might be occurring and what I might be missing would be greatly appreciated.

Thank you in advance for your help.