cmake 4.x: Configuration fails with `Compatibility with CMake < 3.5 has been removed from CMake.`. Workaround: `-DCMAKE_POLICY_VERSION_MINIMUM=3.5`.

[dreirund]

Ahoj,

with cmake 4.x, some changes did occur that break the cmake run for this package.

I get the following error when doing cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr .:

CMake Error at CMakeLists.txt:3 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.


-- Configuring incomplete, errors occurred!

Adding -DCMAKE_POLICY_VERSION_MINIMUM=3.5 does work around this, but as I got from some other project, the cmake configuration code/ options should be updated to cater for cmake version 4.x.

I am using cmake version 4.0.2.

The project AIS-catcher had a similar issue, they could fix it by an update, see the patch linked in this comment. Maybe that can help you, too.

Regards!

[AlexandraTrifan]

Hi,

Thank you!
I will add the fixes in the following days.

-Alexandra