ROOT on MacOS X

[1] Compilation Conditions

MacOS X Release 10.11
standard Mach Kernel (Darwin 15.6.0)
gcc-5.3.0-1osx10.11
gsl-2.2.1-10.11hepx3a
XQuartz's X11 (v.2.7.11) for MacOS X
CERNLIB-2006
pythia-6.428-10.11hepx2a.x86_64
pythia8-215-10.11hepx1a.x86_64
fftw3_gcc-3.3.4-1osx10.11

Get the source tar ball from ftp://root.cern.ch/root/ and expand it as

$ tar -zxvf <somewhere>/root_v6.08.00.source.tar.gz

then follow the steps below:

$ tar -zxvf <somewhere>/pythia6.tar.gz
$ cd pythia6
$ patch -p1 -s < <somewhere>/pythia6416-gfortran.patch
$ ./makePythia6.macosx
$ mkdir ../root/lib
$ cp -p libPythia6.* ../root/lib
$ cd ../root
$ export ROOTSYS=`pwd`
$ export DYLD_LIBRARY_PATH=$ROOTSYS/lib
$ export PATH=$ROOTSYS/bin:$PATH
$ patch -p1 -s < <somewhere>/root_v5.28.00-macosx10.6.patch
$ patch -p1 -s < <somewhere>/root_v6.08.00-macosx.patch
$ ./configure --with-cc=gcc --with-cxx=g++ --with-f77=gfortran --with-ld=g++ --with-pythia6-libdir=/opt/pythia/v6.428/lib --with-pythia8-incdir=/opt/pythia/v8.215/include --with-pythia8-libdir=/opt/pythia/v8.215/lib --enable-minuit2 --enable-roofit --enable-gdml --enable-mathmore --enable-gsl-shared --with-finkdir=/opt/osxws --disable-cocoa --disable-bonjour --with-xml-incdir=/usr/include --with-xml-libdir=/usr/lib --enable-unuran
$ make

where <somewhere> stands for a directory into which you downloaded the source tarballs and my private patch for root to compile with gfortran.

[3] Installation of a Precompiled Binary Package

Thanks to Remi Mommsen and the ROOT team, ROOT for MacOS X is now available as a Fink package or as a binary tarball from the official ROOT site.

Alternatively, you can use an RPM package through APT/RPM as

$ su
# apt-get update
# apt-get install root
# apt-get clean

Before using ROOT, set up enviromental variables by sourcing a setup script as

$ . /opt/root/6.08.00/bin/thisroot.sh

Now you are ready to use ROOT.