use GNUInstallDirs

[telepathyim]

use GNUInstallDirs

[Kaffeine]

I think we'll fix this in a few days. This task is easy to implement but hard to test.

[Kaffeine]

It seems that anything related to the CMake mess is not Easy. Any change leads to a number of other wanted refactoring. I need to get some more experience with CMake before taking this task.
Maybe it will be easier to rewrite from scratch than to update step-by-step. We need to make a new release with Python 3 support (already merged) and it would be much better to release with proper export for CMake targets.

[Kaffeine]

Hi @DerDakon,

I pushed a commit with GNUInstallDirs to the staging branch. Would you mind to test if it works for you? I did some local testing, but it definitely worth to test better.

[Kaffeine]

@DerDakon, thank you for the inline comment. It seems that I also messed up the commits during rebase, so the referenced commit had extra changes.

I force-pushed the branch, the new/fixed GNUInstallDirs commit ref is 019018e

[DerDakon]

Works for me.

[Kaffeine]

5f9d4fb