These examples are from pythia8

To build and run the examples:
define PYTHIA8_HOME
check config.csh, config.sh, and GNUmakefile
   edit variables if necessary
source the config file
make
./main31.exe
./main32.exe main32.cmnd hepmcout32.dat

bash: 
export PYTHIA8_HOME=/some/path/to/pythia8xxx
source config.sh 

csh:  
setenv PYTHIA8_HOME /some/path/to/pythia8xxx
source config.csh