I guess there is a mismatch in the C++ language standard used by different libraries (i.e. GammaCombo and ROOT).
You need to make sure that the same “-std=...” C++ compiler flag is used when building all your software.
One of the first flags in the output of “root-config --cflags” is " -std=..." (and this tells you what C++ language standard your ROOT binaries were built with).
Looking at your first screenshot, I can see “HAS_CPP17 - Success”. This may suggest that the GammaCombo is using “-std=c++17”.
You have two options then.
-
You can build ROOT using:
cmake -DCMAKE_CXX_STANDARD=17 ... -
You can build GammaCombo using the same standard as your existing ROOT is using. E.g., if ROOT is using “
c++=14”, you could try to build GammaCombo using:cmake -DCMAKE_CXX_STANDARD=14 ...