Problem when installing ExRootAnalysis in Madgraph on OS11.3.1

Hi,

I just bought a new MacBook Pro with OS11.3.1. When installing ExRootAnalysis, it said:

>> Compiling tmp/src/ExRootAnalysisDict.cc
>> Compiling src/ExRootFilter.cc
>> Compiling src/ExRootXDRReader.cc
>> Compiling src/ExRootSTDHEPReader.cc
>> Compiling src/ExRootFactory.cc
>> Compiling src/ExRootTreeWriter.cc
>> Compiling src/ExRootResult.cc
>> Compiling src/ExRootStream.cc
src/ExRootStream.cc:81:31: warning: result of comparison of constant
      -9223372036854775808 with expression of type 'int' is always false
      [-Wtautological-constant-out-of-range-compare]
    if(fFirstLongMin && value == LONG_MIN)
                        ~~~~~ ^ ~~~~~~~~
src/ExRootStream.cc:86:36: warning: result of comparison of constant
      9223372036854775807 with expression of type 'int' is always false
      [-Wtautological-constant-out-of-range-compare]
    else if(fFirstLongMax && value == LONG_MAX)
                             ~~~~~ ^ ~~~~~~~~
2 warnings generated.
>> Compiling src/ExRootClasses.cc
>> Compiling src/ExRootTreeBranch.cc
>> Compiling src/ExRootTreeReader.cc
>> Compiling src/ExRootProgressBar.cc
>> Compiling src/ExRootLHEFReader.cc
>> Compiling src/ExRootUtilities.cc
>> Building libExRootAnalysis.so
clang: error: no such file or directory: 'libExRootAnalysis.so'
make: *** [libExRootAnalysis.so] Error 1
Error detected during the compilation. Please check the compilation error and run make manually.

I tried many versions, from 2.7.3 to 3.1.1, and they all yielded the same error. Could you tell me what happened? Thanks a lot!