1. Modify the file ".cshrc" to add a line 
setenv LD_LIBRARY_PATH /usr/local/lib if there is  
no "setenv LD_LIBARY_PATH" sentence  in the file. 
Otherwise, add ":/usr/local/lib" at the end of the 
"setenv LD_LIBARY_PATH ..."  sentence. 
For example: If you already have a line like 
"setenv LD_LIBRARY_PATH /usr/lll" in the file, then  the line becomes 
"setenv LD_LIBRARY_PATH /usr/lll:/usr/local/lib". 

2. At the begining of your program,  add the two  lines: 
#include<iostream>
using namespace std;