here is a script I made (with help from hanu) that finds all newly installed files.
install Numeric Python then run the script with Numeric as an argument and it will create a Numeric folder in your home with all the installed files. You may need to clean any extra files from it like logs and such that were created around the time Numeric was installed
dirs=`ls /|grep -v dev|grep -v proc|grep -v sys|grep -v mnt|grep -v home|gre p -v root`
if [ "x$pkg" = "x" ];then
echo "usage $0 packagename"
mkdir -p $tmp
rm pkglist 2>/dev/null
for i in $dirs;do
find /$i -cmin -5 -not -type d >>pkglist
tar cvzTf pkglist $1.tgz