Himanis-MacBook-Pro:run himani$ root -l sim_complete.C 
root [0] 
Processing sim_complete.C...
Warning in <TClassTable::Add>: class PndSdsTask already in TClassTable
Warning in <TClassTable::Add>: class PndSdsMCPoint already in TClassTable
Warning in <TClassTable::Add>: class PndSdsDigi already in TClassTable
Warning in <TClassTable::Add>: class PndSdsStrip already in TClassTable
Warning in <TClassTable::Add>: class PndSdsDetector already in TClassTable
FairRootManager::OpenOutFile("sim_complete.root")
[INFO   ] Media file used : /Users/himani/PANDA/pandaroot/geometry/media_pnd.geo  
Info in (PndGeoHandling::Instance): Making a new instance using the framework.
 -I container name PndEmcGeoPar
<I> PndEvtGenDirect
<I> Particle: pbarpSystem
<I> decfile: /Users/himani/PANDA/pandaroot/macro/run/2pipi.dec
<I> pbar-Momentum: 7.24
<I> Rnd Seed: -1
<I> Rnd Seed changed to 22672
EvtGen:Initializing EvtGen
EvtGen:Storing known decay models
Will register EvtPythia
EvtGen:Main decay file name  :/Users/himani/PANDA/pandaroot/pgenerators/EvtGen/DECAY.DEC
EvtGen:PDT table file name   :/Users/himani/PANDA/pandaroot/pgenerators/EvtGen/evt.pdl
EvtGen:Initializing RadCorr=PHOTOS
EvtGen:No RadCorr engine given in EvtGen::EvtGen constructor, will use default EvtPHOTOS.
EvtGen:In readDecayFile, reading:/Users/himani/PANDA/pandaroot/pgenerators/EvtGen/DECAY.DEC
root.exe(11369) malloc: *** error for object 0x7fff74049860: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Himanis-MacBook-Pro:run himani$ 

Himanis-MacBook-Pro:run himani$ gfortran --version
GNU Fortran (GCC) 4.6.3
Copyright (C) 2011 Free Software Foundation, Inc.

Himanis-MacBook-Pro:run himani$ gcc --version
i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)
Copyright (C) 2007 Free Software Foundation, Inc.