Heads up with one kdenlive dependency for 19.04: rttr

[Luca Beltrame]

Hello,

as part of Applications 19.04 I found out that kdenlive added a new dependency 
in the form of the rttr library. The current approach present in the 
repository however is far than ideal, because it is configured to only link 
against a statically built rttr as opposed to a shared library, due to some 
unspecified problems (mentioned on IRC, but I didn't have time to further ask 
questions). This means that even if rttr is present, cmake will fail (the 
target has a different name if it's static or dynamic)

Most of the distributions would build it as a shared library, so this point 
needs investigation. I'm currently testing linking and building against rttr 
built as a shared library (people in #kdenlive mentioned some issues, but I 
had no time to follow up). 

For distributions in general, you may need to be aware of a couple of issues 
with rttr:

- Currently you need to disable building examples or they won't build 
(https://github.com/rttrorg/rttr/issues/224)
- cmake is configured to install header files only owner readable, making them 
useless when installed system wide (only root would be able to read them; 
https://github.com/rttrorg/rttr/issues/147; https://github.com/rttrorg/rttr/
pull/228)

The kdenlive team said they might be planning to bundle rttr. As a packager I 
hope it is not the case. Most distributions are against bundling for many good 
reasons.

-- 
Luca Beltrame
GPG key ID: A29D259B
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