Failed to add inotify watch for some asset.

Trying to build the debug build on Arch Linux. When starting:

$ make run
...
DBG Texture has been loaded from assets/converted/Data/graphics.drs/4015.slp.png
INFO Loading meta file: assets/converted/Data/graphics.drs/4015.slp.docx
 ERR Error: WARN cpp/assetmanager.cpp:62 (std::shared_ptr<Texture> openage::AssetManager::load_texture(const std::string &), thread 0): Failed to add inotify watch for assets/converted/Data/graphics.drs/4015.slp.png
INFO cleanup container
CRIT Exception: Error: WARN cpp/assetmanager.cpp:62 (std::shared_ptr<Texture> openage::AssetManager::load_texture(const std::string &), thread 0): Failed to add inotify watch for assets/converted/Data/graphics.drs/4015.slp.png
Makefile:46: recipe for target 'run' failed
make: *** [run] Error 1

Any ideas?

(Would be great if I could get it to run, we'll probably do a small openage dev hackathon in Switzerland in 2 weeks.)

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Start at cpp/assetmanager.cpp:62 and reproduce the failure with make run on Arch Linux, using the asset path shown in the report. Trace why adding the inotify watch fails; done means the debug build starts successfully without the reported asset-watch exception.