ROOT on MacOS X

[1] Compilation Conditions

MacOS X Release 10.7.3
standard Mach Kernel (Darwin 11.3.0)
gcc-4.6.2-1osx10.7
gsl-1.15-10.7hepx1a
Apple's X11 for MacOS X
CERNLIB-2006
fftw3-3.3-0osx10.7

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

$ tar -zxvf <somewhere>/root_v5.32.02.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
$ ./configure --with-pythia6-libdir=<somewhere>/root/lib --enable-minuit2 --enable-roofit --with-fftw3-incdir=/usr/osxws/include --with-fftw3-libdir=/usr/osxws/lib --enable-gdml --enable-mathmore
$ 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

$ . root_v5.32.02-macosx10.7-x86_64/bin/thisroot.sh

Now you are ready to use ROOT.