ExRootAnalysis Install AvailabilityMacros.h

I am running macOS 10.14.1 and have managed to get MadGraph5 up and running by installing gcc@7 and have run through the tutorial to create the ttbar unweighted_event.lhe file. I would now like to develop the tools to do some truth level analysis with some simple ROOT ntuples. It seems this can be done quite simply with ExRootAnalysis rather than the terrifying mess that is the entire CMSSW framework for MC generation.

Here's what I get upon attempting to install:

MG5_aMC>install ExRootAnalysis
Downloading http://madgraph.phys.ucl.ac.be/Downloads/ExRootAnalysis/ExRootAnalysis_V1.1.5.tar.gz
  % Total % Received % Xferd Average Speed Time Time Time Current
                                 Dload Upload Total Spent Left Speed
100 50124 100 50124 0 0 106k 0 --:--:-- --:--:-- --:--:-- 106k
compile ExRootAnalysis. This might take a while.
>> Generating tmp/src/ExRootAnalysisDict.cc
Error: cannot open file "AvailabilityMacros.h" /usr/local/Cellar/root/5.34.26/include/root/RConfig.h:384:
Warning: Error occurred during reading source files
Warning: Error occurred during dictionary source generation
!!!Removing tmp/src/ExRootAnalysisDict.cc tmp/src/ExRootAnalysisDict.h !!!
Error: rootcint: error loading headers...
make: *** [tmp/src/ExRootAnalysisDict.cc] Error 1
Error detected during the compilation. Please check the compilation error and run make manually.

Any ideas?