# How to prevent cmake from getting source if the package is already installed.
**URL:** https://discourse.cmake.org/t/how-to-prevent-cmake-from-getting-source-if-the-package-is-already-installed/5114
**Category:** Usage
**Tags:** os:linux
**Created:** [February 25, 2022, 11:01am UTC](https://discourse.cmake.org/t/how-to-prevent-cmake-from-getting-source-if-the-package-is-already-installed/5114 "2022-02-25T11:01:21Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@MatN](https://discourse.cmake.org/u/MatN)
#### Post date: [February 25, 2022, 11:01am UTC](https://discourse.cmake.org/t/how-to-prevent-cmake-from-getting-source-if-the-package-is-already-installed/5114/1 "2022-02-25T11:01:21Z")
System x86\_64, Fedora\_35. I am trying to build LinuxDeploy locally. This consistently fails in CImg . This is header-only source, which is installed via the package manager (package CImg-devel on Fedora). Two problems:
- It does not see that it is installed.
- If pulls down the source from github, and it still does not find it.
It requires “CImgConfig.cmake” and “cimg-config.cmake” but the sources contains only the .h files. It looks to me that it wants to build CImg again, but why?
How can I fix this?
---
### Author:  [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [February 25, 2022, 12:16pm UTC](https://discourse.cmake.org/t/how-to-prevent-cmake-from-getting-source-if-the-package-is-already-installed/5114/2 "2022-02-25T12:16:53Z")
> [@MatN](#):
>
> It does not see that it is installed.
Does `LinuxDeploy` (whatever that is) care? Is it searching for CImg or does it just always download it. If it isn’t searching, CMake can’t do anything about it.
> [@MatN](#):
>
> How can I fix this?
It sounds like a LinuxDeploy problem to me. I’d talk with its developers.
---
### Author:  [@MatN](https://discourse.cmake.org/u/MatN)
#### Post date: [February 25, 2022, 2:07pm UTC](https://discourse.cmake.org/t/how-to-prevent-cmake-from-getting-source-if-the-package-is-already-installed/5114/3 "2022-02-25T14:07:22Z")
> ```
> Ben Boeckel ben.boeckel
>
> ```
>
> February 25\> MatN:
>
> > It does not see that it is installed.
> > Does LinuxDeploy (whatever that is) care?
Linuxdeploy is an AppImage builder
([GitHub - linuxdeploy/linuxdeploy: AppDir creation and maintenance tool. Featuring flexible plugin system.](https://github.com/linuxdeploy/linuxdeploy)). Getting the source (git
or zip) gets a linuxdeploy-master directory with the source/build/test
stuff below it. It includes CImg.h in
linuxdeploy-master/src/core/appdir.cpp . Have not looked why it uses an
image manupilation library.
> Is it searching for CImg or does it just always download it. If it
> isn’t searching, CMake can’t do anything about it.
>
> > MatN:
> > How can I fix this?
> > It sounds like a LinuxDeploy problem to me. I’d talk with its
> > developers.
Eh, how can this be an linuxdeploy problem? By including a simple
include file?
linuxdeploy is normally built by running ci/build.sh from the
linuxdeploy-master dirctory, but then it gives the another complaint
about not finding boost (also headers only), which is installed:
---
### Author:  [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [February 25, 2022, 5:53pm UTC](https://discourse.cmake.org/t/how-to-prevent-cmake-from-getting-source-if-the-package-is-already-installed/5114/4 "2022-02-25T17:53:38Z")
> [@MatN](#):
>
> Eh, how can this be an linuxdeploy problem? By including a simple
> include file?
If LinuxDeploy doesn’t search for CImg properly, how else is CMake supposed to know what to find?
I glanced at the project and it has a `FindCImg.cmake` file in the repository. You’ll have to investigate why it doesn’t find things on your machine. The `--debug-find` flag to CMake should be able to shed some light there.
---
### Author:  [@MatN](https://discourse.cmake.org/u/MatN)
#### Post date: [February 27, 2022, 9:00pm UTC](https://discourse.cmake.org/t/how-to-prevent-cmake-from-getting-source-if-the-package-is-already-installed/5114/5 "2022-02-27T21:00:32Z")
The --debug-find and --debug-trycompile flags were very helpful, thanks for the tip. It found the FindCImg.cmake after adding -DCMAKE\_MODULE\_PATH="$REPO\_ROOT"/cmake/Modules to Cmake’s cmd line. However, there is more wrong with the project: the include directory is in the wrong place, several sources file are missing which are actually part of the program, a dependency on args.hxx is nowhere specified; after fixing all that, it still fails to link. The source I retrieved is not compilable.
---
### Author:  [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [February 28, 2022, 3:22pm UTC](https://discourse.cmake.org/t/how-to-prevent-cmake-from-getting-source-if-the-package-is-already-installed/5114/6 "2022-02-28T15:22:35Z")
This sounds like something to discuss with LinuxDeploy to me as this is their scripts at this point not handling your setup. Their install instructions and/or `Find*` code don’t seem to account for whatever environment you have around.
---
### Author:  [@MatN](https://discourse.cmake.org/u/MatN)
#### Post date: [February 28, 2022, 3:37pm UTC](https://discourse.cmake.org/t/how-to-prevent-cmake-from-getting-source-if-the-package-is-already-installed/5114/7 "2022-02-28T15:37:07Z")
I agree, I’ll take it up with them.
Thank you for your assistance.
Mat