Building GalSim with the LSST stack

Notes from Chris Walter for building Galsim for LSST members using anaconda 2.1 and the Winter 2014 DM stack. The stack+anaconda should contain all dependencies except for TMV which you will need to build yourself.

Update: Later versions of the LSST DM stack fix the problem with the anaconda library (if you let LSST install anaconda for you, that is), so none of the below machinations with install_name_tool are necessary.

Useful references related to problems with GalSim and boost and boost generally:

http://stackoverflow.com/questions/23771608/trouble-installing-galsim-on-osx-with-anaconda https://svn.boost.org/trac/boost/ticket/9141

Procedure

Make sure that you have setup the DM stack and:

setup boost
setup scons
setup fftw

Install TMV (>= 0.72 from http://code.google.com/p/tmv-cpp/). For example:

scons install PREFIX=/Users/walter/LSST/GalSim/tmv-0.72

Go to your anaconda library directory. For example:

cd LSST/anaconda/lib/

Look at the python library from anaconda:

otool -L libpython2.7.dylib

You will see the first entry (libpython2.7.dylib) has no full path this is going to cause the loader to grab the system version instead and mess things up. You need to fix this:

install_name_tool -id  $PWD/libpython2.7.dylib libpython2.7.dylib

Now if you do the otool -L libpython2.7.dylib the first entry should have the full path.

Now make the same change to the stack supplied boost library. Go to your stack boost library directory:

cd $BOOST_DIR/lib
install_name_tool -id $PWD/libboost_python.dylib libboost_python.dylib

There is one more change you need to make. You need to tell the stack's boost which system python to use. It is also currently entered without a path.

An example:

install_name_tool -change libpython2.7.dylib /Users/walter/LSST/anaconda/lib/libpython2.7.dylib libboost_python.dylib

Download GalSim (from https://github.com/GalSim-developers/GalSim/releases)

Now build Galsim. For example:

scons TMV_DIR=/Users/walter/LSST/GalSim/tmv-0.72 FFTW_DIR=$FFTW_DIR