I had some trouble building rootana on my new laptop, running MacOS 10.15.4 (Xcode 11.5).

Most of rootana compiled fine, but the steps with rootcint fail.  For instance:

rootcint -f obj/TMainDisplayWindowDict.cxx -DHAVE_ROOT   -DOS_LINUX -DOS_DARWIN -I./include 
include/TMainDisplayWindow.hxx include/TMainDisplayWindow_LinkDef.h
In file included from input_line_12:12:
In file included from ./include/TMainDisplayWindow.hxx:4:
In file included from /Applications/root_v6.18.99/include/TGClient.h:27:
In file included from /Applications/root_v6.18.99/include/TString.h:26:
In file included from /Applications/root_v6.18.99/include/TMathBase.h:32:
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:317:9: error: no member named 
'signbit' in the global namespace
using ::signbit;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:318:9: error: no member named 
'fpclassify' in the global namespace
using ::fpclassify;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:319:9: error: no member named 
'isfinite' in the global namespace
using ::isfinite;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:320:9: error: no member named 'isinf' 
in the global namespace
using ::isinf;
      ~~^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/cmath:321:9: error: no member named 'isnan' 
in the global namespace

This is probably a problem with my Xcode installation.  But I found a work-around, which was explicitly 
defining CPATH before the rootcint command in the Makefile:
obj/TMainDisplayWindowDict.cxx obj/TRootanaDisplayDict.cxx obj/TFancyHistogramCanvasDict.cxx: 
obj/%Dict.cxx:
    CPATH=/usr/local/include rootcint -f $@ $(CXXFLAGS_ROOTCINT) -I./include include/$*.hxx 
include/$*_LinkDef.h

obj/TNetDirectoryDict.cxx: obj/%Dict.cxx:
    CPATH=/usr/local/include rootcint -f $@ $(CXXFLAGS_ROOTCINT) -I./include include/$*.h 
include/$*_LinkDef.h

As I say, this is probably a problem with my installation; but I include the work-around in case it is helpful.

In the medium term we will try to remove the dependence on the old, ugly rootcint, since it often has 
problems.

In running alphaAnalysis.exe, a instance of manalyser, I would like to use the ---usetimerange option. When I include it on the commandline I get back the messages including this option which suggests that it is input incorrectly, but I also don't see it anymore in the manalyzer.cxx code.
Has it been deliberately removed, and, if so, should not the help be amended to reflect this. This option would be highly useful to me.