[QGIS-Developer] Subject: Need guidance on building a C++ QGIS plugin with CMake — missing QGISConfig.cmake

[Chaitanya Kumar]

Dear QGIS Developers,

I am currently trying to create a C++ plugin for QGIS using CMake on
Windows, but I’m facing issues during the build process.

When I configure my project with CMake, I receive the following error:

> Could not find a package configuration file provided by "QGIS" with any
of the following names:
> QGISConfig.cmake
> qgis-config.cmake
>
> Add the installation prefix of "QGIS" to CMAKE_PREFIX_PATH or set
"QGIS_DIR" to a directory containing one of the above files.
> If "QGIS" provides a separate development package or SDK, be sure it has
been installed.

I have installed QGIS 3.44.2 through the OSGeo4W Advanced Install option,
and I’ve made sure to select and install the following packages:

- qgis
- qgis-deps
- qgis-common
- qgis-devel

Since my plugin uses Qt, I’ve also installed:

- qt5-devel
- qt5-libs
- qt5-tools
- qt5-libs-symbols

Despite this, I’m unable to locate the `QGISConfig.cmake` or
`qgis-config.cmake` file in the installation directories (checked under
`C:\OSGeo4W\apps\qgis\lib\cmake` and other subfolders).
Additionally, while these packages were installed via OSGeo4W, I also
noticed that **CMake itself is not available or detected in the
environment**, even though it’s listed as an installable component.

Could you please guide me on how to properly set up the build environment
for a C++ QGIS plugin, and how to make CMake recognize the QGIS development
files?
If there is a specific way to enable or locate the `QGISConfig.cmake` file
within the OSGeo4W setup, I would really appreciate your advice.

Thank you very much for your time and assistance.

Best regards,
Mutukula Chaitanya Kumar
Hyderabad, India
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