The obconf-qt has a missing '$' in src/CMakeList.txt causing a wrong theme path to be compiled in. Reproducible: Always Steps to Reproduce: emerge -1 obconf-qt
Created attachment 407684 [details, diff] fix ro add the the missing '$'
Thanks for reporting, I will ask upstream to fix it and than do a version bump with fix.
See https://github.com/lxde/obconf-qt/pull/13
Please, test.