can't get main.cpp to compile with this command 'g++ -o main -L/usr/local/lib/ -Igpstk/src/ main.cpp'
/usr/local/lib/libgpstk.so does exist
also tried with option '-lgpstk' but that didn't work either
this compilation follows the commands shown here: http://www.gpstk.org/bin/view/Documentation/GPSTkExample1